First off, this is all IMO but
Brighton is the college man's mountain. Cliffs and rails. You get a little taste of it all.
Park City is fun but get used to a park that doesn't get changed up too often, and you have to get used to getting snaked / closer skiing to people on features.
Alta is tight but a lot of rich, older white people and powder hounds tear it up. its backcountry is of course, well, its fucking Alta man it's an experience. Snowbird is backcountry as well but they allow snowboarders and have a much more chill vibe I think. Little more relaxed.
Plus I think Snowbird attempted a tiny little park this year? Maybe? Can someone validate or disclaim this?
Anyways
Can't really confirm canyons or deer valley. I've never skiied there and none of my homies do.
TL;DR
PC = Sick park, meh big mountain
Alta = It's fucking Alta, but snobby old people and BC slayers.
Snowbird = Bit more chilled out, only BC again but its legendary.
Brighton = Little taste of everything