I had an epic time at tremblant last year and will ne there january and hopefully Jays peak this year as well.
If you are usually at blue and moonstone then u will love tremblant! I should add though the black diamonds at blue are not really blacks.
I cant compare to Killington but Tremblant is way way better than blue, and has good nightlife too.
I would be shocked if you went to Tremblant if you felt the need to try to get some night rides in at another resort, stepping up from Blue Mtn you will be plenty tired by sundown, and ready to hit the faux village for dinner, drinks etc.