which on would be the best I mostly ride in the woods with big steep rocky hills. and in a big pasture. but sometimes i like to go mudding which on would be te best for me.and i like going fast

 

I think you may be happier with a Kodiak 450, judging by the type of riding you want to do.

 

Sorry, there is no way in hell I would by a kodiak over the Z. But that's the way I ride. My freind at work bought a kodiak last week, and for a 4x4 it's OK, but if you like going fast, no race. Probably the kodiak has the edge in the DEEP mud, but then you shouldn't be asking this question.