Hmm, Haven't driven a 22 yet. Just about the only reason why I love it, is because it's something new. The B4 has had an upgrade with a longer chassis, it can keep up on a track to the 22 now, but still doesn't have the "cool factor"
EDIT: I love my B4 to bits, but right now that's just the problem... it's in too many bits Three years of hard bashing and dominating tracks...I think it held up fine, Haven't even tried my new Mamba Sv2!
So realistically I like the B4 better, a pretty forgiving buggy to drive compared to some others I've driven, but I still haven't driven a 22