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1:10 buggies are probably the most accessible because everyone knows about them. They give you flexibility on the surface they run on. The issue with those will be the disparity between handling, so making actual racing fair between cars will be difficult even if you all use the same motors and batteries.
As @Alex_B said, Kamtec and Mardave ministocks have always been the cheapest way in. They’re more obscure to people and you’ll need a decent surface. However, racing will be equal between cars, the cars are designed to take a beating, huge range of bodies, easy to add outlaw classes and banger meets etc etc. You won’t need a massive track or space to use them.
Just floated the idea of a racing slot at the church hall. My background was 1:10th buggies but wondering what would be the class with the lowest barrier to entry - some kind of mini stock on road? Or Tamiya TT02 racing?