Bridger has some really gnarly terrain (the gnarliest in the US imo, were talking shoulder width slots that you can straightline and stuff) and great BC access. It also becomes a bit of a disaster on pow days, again, IMO. Slushmans lift ends up with like an hour plus wait sometimes. And if it hasnt snowed in a while, there arent a ton of options.
Big Sky doesnt have the same BC access, and slightly less gnarly terrain, however it has cool wide open steep stuff off the tram, North Summit snowfield, and a ton of other options. Even on "crowded" days people are pretty spread out. Also Big Sky has a park. This year they have build a decent jump line as well.
Moonlight has a cheaper pass but its smaller. They have some good terrain like the headwaters, but no tram access. They also have some fun tree skiing. And finally moonlight is the emptiest resort on earth. weekedays often feel like you have it to yourself. Its also colder because its on the north side of the mountain. They have a ton of great jib features, and usually some jumps as well.