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.
This is correct. Killington is definitely a nice place to ski/ride, but it tends to be very packed and very tourist-y. I think Jersey Shore on skis is a pretty good description haha. I do love riding there though.
Stowe is one of my personal favorites. I've heard great things about Jay Peak but have never had the opportunity to go that far north.