my trx 250 1985 can get though any thing almost a 4x4 can go though i have got in to 2foot of muddy water and i though it easy as pie

 

I would say the majority of this decision would be, what kind of riding you want to do. I ride w/ guys who are absolutely nuts about mud holes, but that doesn't do allot for me. I like the little speed burts that it takes to get through tricky terrain on a 2wd. You want to talk about a rush... the only thing going to save your rear is gas and courage/know-how, and I like having the challenge of picking the right line so I don't bottom out my Warrior. If I come to a huge mud hole, I can either try and get pulled out if I don't make it (which I don't mind) or there is USUALLY another option around the whole.

I would say that other than SERIOUS rock crawls, and DEEP mud, a 2wd machine (even Warrior or 300EX) will keep up or pass a 4x4, as long as the rider knows what he/she is doing.

I got my Warrior just for the challenge and "pep" it has.