Both have there strong points but in my opinion for this state I would pick the jeep. Idaho, maybe not. I had ATVs up until 2010 when everyone I new was switching to UTVs, I looked at the cost of them and thought I could buy a good used jeep for the same money. I wound up buying a new jeep so no money saved by me on the transition but I am happy that I went with the jeep. I am also pretty sure I would be saying the same thing if I had gone the UTV route.

What I like about the jeep verses UTV:
No Trailering.
No transfer of gear to/from tow rig to/from UTV.
I can lock things inside the jeep out of the sight of prying eyes.
The jeep is quieter
UTVs do have a fun factor that the jeep can't match and have a faster, smoother ride over rough terrain.
Honestly, I think you will be happy either way you go.