I have researched these for the last three years [talking to mechanics, posting on forums, etc.]looking for a combination of utility/power and performance - here's the models I narrowed it down to:
Kuboda - workhorse most dependable
Kaw Mule - also workhorse
Honda MUV - blend of fun and work
I think Can Am makes the best ATVs and I'll bet their UTV is amazing, too. I was told to keep away from Polaris, as their ATVs routinely have issues, yet read reviews and most are very favorable on the Ranger series, so I don't know what to believe.