Northstar is fun but it really is a shit show at the bottom (seeing as there is only one main area that almost everything funnels too) and for some reason is the most popular resort up there (marketing). Another annoying thing is there is no direct lift to the top.
Get on the back side and it's better with nice long runs, not as crowded (but still had to wait).
Squaw is massive. If you have two days, I'd do Squaw and Alpine everytime. That is a lot of terrain right there. Shuttles between the two take 20-30 minutes. Alpine is smaller but nice as well. Honestly, I spent 3 days at these two and probably didn't even hit 40% of the terrain yet