Race Inspired Tamiya TRF 801XT build

[Hyper-5]

hey, really nice buggy you've got there, hope is goes graet, just a quick one if anyone knows, lm looking at buying a trf buggy, either the TRF501X or TRF502X, lm not to sure which one would be better because the 501X is belt driven and the 502X is shaft driven, which one is better and why? (there are also more parts for the 501X than the 502X)