Replying to Planning Europe Ski Trip (France) Need Advice/Help

Need some Details guys, for those that have been there, or know a lot about the place.
Whats a good time to go..Im planning on doing the Tignes Route or Chamonix. How does it compare to let say Alta, Whistler, Aspen, Etc...U get the Point. When does the Pow Fall, Park in good shape?? Im planning on heading Dec 27th-Jan10th...I have a friend who is in school in Sweden and I will be to either Amsterdam or Stockholm, then busing around partying, and then fly to paris and head to the hills. Thats the plan...

Please i would love some more details guys

Thanks for your time,
Coter