I went through the same dilemna when I purchased a quad a couple of years back. It was either a Z400 or Wolverine and I went with the Wolverine. While the Wolverine has been a good bike, I wish that I had gotten the Z. The Z's power dwarfs the Wolv and it goes very well on the trails. I have a 424 on my Wolv and ride 98% of the time in 2wd. I will say that 4wd has come in handy on a few occasions, but I would rather get stuck now and then for the pure fun factor of all that speed and torque.