Electric motors
The main question concerning electric motors is: brushed or brushless?
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Brushed pros: cheaper, simpler, better for off-road.
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Brushed cons: heavier, bigger, worse power efficiency (75-80%), they wear out in time.
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Brushless pros: long lifespan, much better speed and handling, better power efficiency (85-90%).
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Brushless cons: much more expensive, worse for off-road.
So what should we get? It depends on your budget, but brushed motors work just fine, and besides, for self-driving purposes, you don’t need a RC car that drives 100 KPH.
It’s always possible to swap out a brushed motor for a brushless later on.