Glade: Belleayre wins this one. A bunch of marked glades.
Lifts: Windham. 2 High speed lifts, and none of that constantly breaking down stuff at Hunter...
Length of Trails: Probably Hunter. Belt Parkway provides a great long cruiser, and where else can you find steep and really long bump runs like Hunter West south of VT? There are also black runs stretching from summit all the way to base. It's not like at Belleayre, the top 300 vertical is black, and Windham where there is like a couple hundred vertical feet of black, there's blacks going all the way down almost. And Hunter is bigger than Belleayre and Windham.
Snowmaking: Hunter? Duh.
Bumps: Definitely Hunter.
Challenge: Definitely Hunter.
Hunter markets themselves to the advanced and expert, Windham to the intermediate, and Belleayre for the less crowds. But, in my experience at Belleayre, it was barely less crowded than Hunter and Windham would be and doesn't make up in terrain.
Sure Belleayre would be nice for one day, but I personally like Hunter and Windham more (Hunter being my favorite).