Well I'm spoiled. I like my 5th wheel and I like a place with good showers and bathroom facilities (especially if I'm staying there for more than a couple of days) and I like to be beside a nice lake in the mountains....
So, my #1 choice is Two Jack Lake (lakeside campground)!
Plus its still quite close to the town of Banff where you can go for a nice dinner out or a movie or other stuff.