both would be arite but i like my b44 on the carpet although the b4 would be alot cheaper considering you do'nt have to change/buy cells to fit saddle pack. but its up to you as they run both in 1 class so you will be able to run it no matter what and if i was you i would wait till they get some jumps in as it gets boring without jumps. btw got my m03 built and ready to race 4 2moz