By “larger” the only area with more vertical than Tremblant and MSA in eastern Canada is Le Massif. I would highly recommend it, it’d even better with the new chair lift and it’s accessible from the top of the mountain, so you don’t have to drive down to the base of the river anymore.
Places like OwlsHead and Orford in the Eastern Townships are smaller than Tremblant or MSA, Jay Peak would be your best bet if you’re heading to that area (but very cold, avoid the Green Mountain Flyer and try to take the tram).
Whiteface is good too, there are places to stay in Lake Placid, I stayed at a Ramada ( or something like that), it was o.k., but I was there for the skiing. The new gondola they put in a few years ago is great.
Can’t say anything about other places in Vermont like Stowe or Killington, haven’t tried them yet.
To sum up, as an alternative to Tremblant and MSA, in no particular order: