Johnson Creek is probably the most popular. One Mile Creek is the one people use a lot because it's the first one you come to when you reach the area.
I chose to go to Wildcat Creek because that seemed like a real challenge. It was very very hard to fish and I only managed to get a little 3-in cutthroat.
I'm ready to finish the slam for the second time and I just need another Yellowstone. Was going to head up there probably next week.