ohhh thats a tough one.   when do you have to book by. if you're not booking till last minute, maybe check the conditions and weather systems coming through then make a choice.  you're not going to go wrong with either, in my opinion. though my first inclination would be to choose Jackson, just because its a little tougher to get to (at least for us) and the town and mountains vibe is AWESOME!
If you can choose both and have the time, its a fun car trip.  2-3 years ago. Skied Utah 2 days, jumped the car, drove up to Jackson for 2-3 days, then drove down to Telluride, CO to catch a FWT event, before flying home out of Durango. great adventure.