Utah (Alta) was awesome, great snow great runs, We went last year and did Park City (great food, atmosphere), Deer Valley (Ok, but pricey), The Canyons (horrible trail layouts) Overall, I would take Alta if you are going to Utah.
We went to Jackson Hole not too long ago (5 years) Massive mountain, good runs, nice area great cruisers and steeps, but for the 5 days we skiied, 3 of them went to Grand Targhee on the opposite side of the mountain from Jackson. We had to drive an hour through mountain roads to get there, but when we got back to the hotel at the end of the day and compared notes with those who skiied Jackson, we had 2 feet of fresh powder, they had slush and crud.
Good luck wherever you end up!