McCall- Great place to ride provided they just received 3' of snow, but other than that a typical day in McCall can get old in a hurry, and far too many miles of gas sucking trails for my liking. I kind of feel sorry for those folks in Boise for instance who have to burn a tank of diesel and 12 or 14 gallons through the sled in an effort to ride, "Yikes" need to be a frickin millionaire to enjoy the day.
Togwotee- Again, a few too many trails for me to get from A-B, if you like tree riding you might enjoy it.
Island Park/West Yellowstone- I feel it has a lot of varied terrain. If you drop off in the right place you can minimize trail riding by dropping into ungroomed creekbeds on your way to the high country. Once you hit the high country you can always find terrain steep and scary enough for the biggest Adrenaline Junky. Those who don't require a thrill ride can ride open meadows or trees if they like and all this can happen within a mile or two of each other. It's really outstanding one size fits all terrain.
Cooke City- Again, I feel it's a great ride with a few feet of fresh, but with typical snow conditions the terrain is either a bit boring or too steep to safely ride, not enough varied intermediate terrain for myself anyway.
My Backyard/Ruby Mountains- Very small legal area to ride but what a fabulous place. Asphalt to the snowline for 6 months a year, great country for a true Adrenaline Junky. Steep narrow chutes, less avy prone than many places. You can do a little tree riding, a little open meadow riding, and if you choose can scare the hell out of yourself most every direction you look. I've never had a dull day in the Rubies, and have rode it 1,200 times over the last 30 years. It's good to be able to be on the mountain in 20 minutes and run about 5 miles down trail, burn only a half tank of gas, get your thrills, and head for out for a great lunch. I call living close to great terrain "Cheapmobiling", that way you can enjoy it 60 or possibly 70 rides a year.