i would say the x6. if you ask people who own x6's which is better between the xfactory x6 and the b4. the x6 will come out on top. footey really is the guy to ask, as i think hes had every car out there available to buy
[sorry shane]
i would say x6's are reasonably strong except the front nose peices. but these are designed not to be as strong to save the chassis and other parts in bigger impacts. [i think]. it is probably easier to work on than other cars aswell.
ive also driven a 'CR' and they are also good cars but according to
my mate, they are a pig to setup if you change tracks. and also he told me they are weak. the x6 is practically the same setup for alot of tracks, just maybe change the springs or oils and then its great for another aswell.
hope this helps.