Schools looking past LEGO for robotics are usually not unhappy with LEGO itself. They are wrestling with budget per learner, the cost of replacing lost parts, or a quiet worry about how long a platform will stay on sale. This is an honest comparison of the two broad families of school robotics, build-system kits and electronics-first platforms, on the things that actually decide a purchase order: cost per seat, spares, curriculum, durability, and longevity risk.

TL;DR

• Build-system kits such as LEGO Spike Prime and VEX IQ start fast and survive rough handling, but they cost more per seat and tie you to one vendor's parts.
• Electronics-first platforms such as the BBC micro:bit and Arduino cost less per seat and teach real wiring and code, but they ask more of the teacher during setup.
• The figure that decides most budgets is cost per seat across three years, not the price printed on a single box.
• Longevity risk is real. LEGO has retired robotics lines before, so choose a platform whose spares you can still buy in five years.
• Keep LEGO when your teachers already know it, your lessons are short, or your learners are very young. Look elsewhere when per-seat budget or a path to real code matters more.

Two ways to build a classroom robot

Almost every school robotics product sits in one of two camps.

Build-system kits hang everything off a plastic construction system. LEGO Spike Prime and Mindstorms, VEX IQ, and Fischertechnik all work this way. Beams, pins, and connectors click together, motors and sensors plug into a hub, and children program the hub from a tablet or laptop. The strength is speed. A learner can go from a box of parts to a moving robot inside one lesson, with no loose wires and nothing to solder.

Electronics-first platforms start from a small programmable board and real components. The BBC micro:bit, Arduino, Raspberry Pi Pico, and similar boards belong here. You connect motors, sensors, and lights to the board, sometimes on a chassis and sometimes on a breadboard, and program it in blocks or in Python. The strength is honesty. What learners wire and code is close to what an engineer actually does.

Neither camp is better in the abstract. They are better for different rooms, timetables, and goals.

Cost per seat, not the price on the box

The sticker price of one kit is the wrong number to compare. What matters is how much it costs to put one learner in front of working hardware, and how that spreads across a few years of classes.

Build-system kits carry a premium for the moulded parts and the closed ecosystem. Electronics-first kits are usually cheaper per unit because the board and a handful of components do not need a full construction system around them. But a school rarely buys one kit per child. A common pattern is a class set of about ten kits shared by a class of thirty in rotation, which changes the maths for both camps.

When you work out cost per seat, spread the kit cost across three years of learners, then add spares and any software or cloud fees. Under that lens the gap between the two camps is often smaller than the shelf price suggests, because the durable build-system kit loses fewer parts while the cheaper electronics kit needs more replacements. Do the sum with your own class sizes before you decide.

Spares, breakage and the running cost nobody budgets for

Every robotics programme has a running cost, and it is the line most first-time buyers forget. Plan to set aside roughly a tenth to a fifth of the kit cost each year for replacements, more in a busy primary classroom.

The two camps fail differently. Build-system parts are tough, but they are small and they walk. A single missing sensor cable or a proprietary connector can idle a whole kit, and you can only buy the replacement from one supplier. Electronics-first parts break more often, since a jumper wire or a cheap motor is easier to damage than a moulded beam, but replacements are commodity items you can source from many vendors and keep in a drawer. One model has fewer failures that are expensive and slow to fix. The other has more failures that are cheap and fast to fix. Match that to how quickly your school can actually get parts, which in South Africa can mean weeks of shipping for a single-source component.

Curriculum: what will you actually teach?

A kit is only as good as the lessons around it. Ask what you want a learner to walk away able to do.

Build-system kits shine at mechanisms and design thinking. Gears, ratios, structures, and iteration on a physical build are their home ground, and the coding sits neatly on top. Electronics-first platforms shine at the link between code, electricity, and the physical world. Learners meet inputs and outputs, sensors and thresholds, and the idea that a program controls real voltage. Both can teach loops, conditionals, and functions perfectly well, and both map onto the coding and robotics strands schools are rolling out under CAPS.

Progression matters as much as the starting point. Check that your chosen platform lets a learner move from blocks to a real text language on the same hardware, so the robot they know does not get thrown away when the coding grows up. A platform that dead-ends at blocks will cost you a second purchase later.

Durability and longevity risk

Durability is about the kit surviving the term. Longevity risk is about the platform surviving the decade, and it is the factor schools underweight the most.

Robotics platforms get discontinued. LEGO has retired robotics lines before, leaving classrooms with hardware they can no longer expand and software that slowly stops being updated. When that happens your investment does not stop working overnight, but it stops growing, and new learners inherit a dead end. Before you standardise a whole school on one platform, ask how long the vendor has committed to selling it, whether spares will outlive the product, and whether the skills transfer if you have to move. An open, widely used board carries less of this risk than a single vendor's flagship, simply because more people depend on it staying available.

A side-by-side comparison

Where an electronics-first board like sheenbot fits

This is where our own hardware sits, so read it as one option among several rather than a verdict. The sheenbot infinity board is an electronics-first platform built for South African classrooms, and it targets the tradeoffs above directly: a lower cost per seat, commodity-style spares you can keep in a drawer, and one board that runs both blocks and MicroPython so learners are not pushed onto new hardware when their coding grows up. If you would rather test the idea before spending, a browser simulator lets a whole class write and run real programs with no kit at all, and schools that outgrow the classroom set can carry the same skills into an FTC competition pathway. A free trial lesson is the low-risk way to watch learners actually use a platform before a purchase order goes in.

Who should still buy LEGO

LEGO remains a strong choice, and switching for its own sake is a waste. Stay with it when several of these are true:

• Your teachers are already trained on it and confident, and retraining would stall the programme.
• Your lessons are short, so the fast setup of a build system buys back real teaching time.
• Your learners are young, and clicking parts together is safer and less fiddly than loose components.
• Your focus is mechanisms and design rather than electronics and text-based coding.
• You already own a large investment in parts, and the ecosystem still meets your goals.

The point of this comparison is not to move you off LEGO. It is to make sure the choice is deliberate and costed, rather than a default you drifted into.

Frequently asked questions

Is a cheaper robotics kit a false economy?

Not automatically. A cheaper electronics-first kit can cost more in spares if parts break often and your school is slow to reorder, or it can cost less overall if replacements are commodity items you keep on hand. Work out cost per seat over three years including spares, and the honest answer falls out of your own numbers.

Will we have to retrain all our teachers?

Some, but less than you fear if you move to a platform that keeps blocks as an entry point. Teachers confident in block coding transfer that knowledge directly, and they can learn the new hardware alongside their first class. Budget a term of overlap where the old and new platforms run side by side.

What about robots that get discontinued?

Favour platforms with a wide user base and spares that outlive the product. Ask the vendor how long they commit to selling the hardware and its parts. An open, widely used board is safer than a single vendor's flagship because so many people depend on it staying on sale.

Can we mix platforms in one school?

Yes, and many schools do. A common split is build-system kits for the youngest grades where fast setup matters most, and an electronics-first board higher up where real coding and tighter budgets take over. Just avoid running more than two platforms at once, since every extra system multiplies training and spares.

How do we try before committing budget?

Use a simulator or a trial lesson before you buy hardware for a whole school. Running a real program in a browser, or watching one class use a kit for an afternoon, tells you more about fit than any spec sheet. Only then commit the purchase order.