Overall, the Canadian Rockies are considerably more beautiful. The only part of the American Rockies that can compare is in Glacier National Park, Montana. Wildlife seems to be more abundant up there too, and there's less tourists.
Mount Robson Provincial Park, BC
Mount Assiniboine Provincial Park, BC
Jasper National Park, Alberta
http://www.ridebooker.com/blog/wordp..._ten_peaks.jpg
Moraine Lake in Banff National Park, Alberta
Yoho National Park, BC
Kootenay National Park, BC