whatever you do, dont go to mt. snow on a weekend. And i think ktown is usually a little less crowded just because its another half hour-40 min away from the southern part of New england. just my opinion though
i dont kno alot about killy but the prob with okemo is that the lift u ride for their big park is the main lift every1 takes so if its crowded it can take awhile, but it def depends on the weekend you go