I was wondering what the best duty station would be in the California, Arizona, Nevada or Texas area be? Any insight would be greatly appreciated. Thanks

The only Active Duty MPs in AZ are at Ft Huachucha. I don't think there are any Active Duty MPs, anywhere, in NV.
So, that narrows your choices.

What about California and Texas?

Not sure what posts are left in the People's Republik. Ft Irwin is the only one that comes to mind. Presidio of Monterey, but I think they have DOD LE on post.

Texas has Ft Bliss, Ft Hood & Ft Sam Houston, not sure of any others.