Havent been to Alta/Snowbird since I was a young'n, but im lucky enough to get a trip out to Jackson once a year and its easily my favorite place in the world. Awesome terrain, great scene, the tram, lift lines arent anything to complain about and they're having a great year snow-wise already. I would definitely pick Jackson. Ill be there for 6 days in December/January, so stoked on that.