What are the main differences between a BMX freecoaster and a cassette hub, and which one would be more suitable for my riding style?

The main difference between a BMX freecoaster and a cassette hub is how they engage when pedaling backward. A freecoaster allows you to pedal backward without the cranks moving, while a cassette hub engages immediately when you pedal backward.

If you prefer doing tricks that involve pedaling backward or fakie tricks, a freecoaster would be more suitable for your riding style. If you prefer a more immediate engagement when pedaling backward, a cassette hub would be a better choice.