VHF is the place to be in this state. I have 2 VHF mobile radios in the vehicle, and I recently got a VHF XTS3000 to handle all the ham and public safety channels.
As for why agencies choose UHF, it seems there isn't much rhyme or reason anymore. Generally, UHF is used in urban areas due to it's building penetration abilities...ie City of Milwaukee PD. That said, a couple counties near me uses UHF for fire/ems which baffles me, considering the terrain is better suited for VHF.
Another reason is licensing. There were (are) far more public safety and non-public safety license allocations on UHF than VHF, due to the amount of spectrum available on both bands. That is why there is a lot of business users on UHF.