Been to Stowe, now that is sick. Buuuut I gotta say Killington is better. Don't out rule Whiteface. I've never been, but they apparently have the tallest mountain on the East Coast. They also have a little "Backcountry" area. IDK about Killington but Stowe was too wooded to do any sidecountry or off trail riding. They have glades but they are pretty sketchy.
I'm not a big fan of Killington because it's a tourist trap...or, more accurately, Jersey Shore on skis. But Stowe has some pretty good spots...you just need to know where to look. If you're looking for glades, you have to check out Jay Peak. They're the pioneers of "off trail" skiing/riding on the East Coast.