Belts vs Shafts for 4WD

[littlened]

I've noticed cars like the Losi xxx-4 and the Cat SX are belt driven, where as the likes of the B44 and ZX-5 are shaft driven.

Just wondering out of interest which people prefer and why.

When I used to race many moons ago I used to have to regularly replace belts on my Cat 2000, but I was only 14 at the time so I may have setup the car wrong.