Jay: Best snow, sweet terrain (glades and small cliffs), good jumps, only a couple good rails, chairs go on wind delay a lot, short lift lines, cheap tickets
Stowe: Best backcountry shit, crowded (but awesome on weekdays), Park is okay (some nice rails)
Smuggs: Can ride park for free on T-bar, good snow, good terrain (nice and steep), slow double lifts
Sugarbush: Pretty good terrain, park has a lot of potential to be awesome (its usually hit or miss), tons of trails and fast lifts
Thats a breakdown of how I see each place. You really can't go wrong. Every mountain has a bunch of good stuff to offer.