I think b/sd is referring to Bridger or Showdown. I grew up skiing Showdown and also put a lot of time in at Great Divide and Bridger.
Great Divide has the best park options, it often time lacks in snow. There are some really cool areas and tree skiing on that mountain, it rarely fills in though.
Showdown is a small, very laid back "mom and pop" style hill. The snowpack and snow quality is usually very good and the snow stays dry for a long time. There is some good steep terrain, 38 degree mogul runs,and some fun tree skiing. Its a really fun mountain when it snows, other times you have to find ways to be creative or go charge moguls or you'll get bored. There is a small amount of touring on the surrounding mountains but the snowpack is usually pretty sketchy until early February.
Bridger is bigger than Showdown in every way (lifts, terrain, crowds. etc...) It has some very sick and unique terrain (slaschmans, ridge terrain, etc...) Bridger can also get very crowded and skied out very fast. The amount of people, and Montana snowpack also means it can get very rocky.
I would say Bridger would be your best option for terrain, Showdown's snow quality and crowds are a lot better.
