I think they oth have goods and bads. I want a 4wd but hate ball diffs, like the Dex but dont like $650 or no parts in the US, Bmax maybe $400 is much better an i am sure they are both very durable. I also am looking at the Cat SX, I wont buy a B44 because they break too much from what I have seen. The d4 would be a good option because its like the B44 but stronger but I hear its getting discontinued. 2wd does hone your skills much better I think it does the best. But lots of cars are old in this class except the xxxcr and the new cougar and the Losi is getting old. The cougar or the new Dex 2wd would be the way to go. But 2wd buggy when driven correctly fast. Another ting is 2wd is popular where I am and 4wd isntreally which sucks.