I can tell you from living in MT for many years that Big Sky is great because of the lack of crowds. Even on holiday weekends, the only place you'll likely find a line is for the tram. Jackson Hole is a paradise if you're and expert, tons of white open terrain. Most CO resorts get more crowded because of their proximity to Denver. If you do drive from Big Sky to Jackson, I'd do a day at Grand Targhee on the way if they have powder. They get more snow than almost anywhere.
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