i live in slc.
you wont go wrong at any of the above resorts.  dont go to pc, canyons, or deer valley if you are strictly trying to ski pow/side country/ fun in bounds terrain.  the above resorts have all of those things.
if you dont care about park at all, go to alta or solitude.  if you are going to want to ski some fun rails and as well as rad terrain.  the bird is def worth it too, but i dont know why that kid said it's cheap, alta and tude's tickets are cheaper.  by like 10-20 bucks.