I'm a part time vermont resident so to speak and have ridden all over VT from Okemo to Jay to Suicide Six and can say there is something for everyone up here. I have been to Mt. Snow twice and will not go back mainly because of crowded lift lines.
I tried to ride there the weekend after MLK and the sign said there was a 30 minute wait at the lift. I didn't buy a ticket and left for Bromley. It seems that with the high lift price and the inability to contain crowds, they lost me and apparently many other locals who I've come accross for that reason.
The shuttle buses are run half ass, pass you by, the lodges are crowded on non holidays and it seems as if other resorts such as Okemo and stowe have lift lines and crowds down to a science. This is just my opinion, if you ride there and enjoy it, have a great day.
I havent been to Killington in years, we have since been residents of the state and it is a good distance from us, and after riding for five years, residents and locals prefer to leave the big mountains for the vacationers and travel to smaller mountains.
I have not ridden Stratton due to personal reasons, but there seems to be a very high brow attitude about the place and that is not what I look for in a mountain that I visit for a day.
Good luck in VT.