I like steep skiing(but not super steep) with moguls and varied terrain. Nothing I've skied beats Snowbird year in and year out. Jackson Hole is steep, but the snow doesn't compare because the mountain is pointed the wrong way. I've skied Squaw only once, but they have snow problems sometimes. Same with Whistler.
Alta is overrated when compared to Snowbird. I find myself skiing the same runs, intermediate runouts, and having to traverse or hike to ski different good stuff, - who needs that. When I point my skis downhill at Snowbird, from just about any lift, I find a diversity of nooks and crannies, caution gates, all without hiking or traversing(too much). And the snow! Good snow is everything, with that Snowbird beats everywhere but Alta hands down, and Snowbird has the obvious advantage on terrain.