montana vacation yellowstone

Traveling to Montana for vacation but can’t decide between Glacier Country and Yellowstone Country. Opinions?
Does anyone know anything about the two locations? We are looking to do things like wildlife viewing, white water rafting, horseback riding, golfing, etc. According to my travel brochures, these activities are available in both locations. So, any feedback or recommendations would be appreciated.
If you cant fit both in, then I would advise Yellowstone. You can do all the activities you highlight but you also have the geothermal features and there are very few places in the whole world where you can experience those.
UK
Vacation: Yellowstone NP & Highway to the sun









