Benji,
They were both designed for dirt, and if i can get my X6 going like paul sinclairs at the clash last year i will be a happy boy, i think the x6 jumps a lot better than the b4 with the 4 gear box and i think chazz, paul and BK will be there to lend a hand as well as some of the uk team including international superstar multiple european A finalist, Tom maximum commitment cockerill.