I’m going to say a grand tour of the Alps and perhaps down the Pyrenees if the weather is poor in the Alps.
I’ve been to PDS loads of times, and had a great time most of the time, I’ve been to les Arcs and had a great time, been the Whistler and had a great time but none of them would keep me happy for a month, the major resorts of the Alps all seem to be within a few hours drive of each other, so it wouldn’t be a major hassle to spend a few days in one place and if you start to get a bit used to it, pop down the road to the next resort. PDS, Verbier, Les Arcs, Chamonix, Saint-Luc, Samoëns all within a few hours of each other with a bit of planning.