Upper Falls must look spectacular in the winter, well both of them probably do. It's always better and more reassuring to use a bath with a few fresh footsteps! I agree when the snow gets too deep it's so much work. I'm sure it's still a tougher climb there in the winter, I don't mind it tho, probably quieter too.

I think full on winter, I never go to Banff because I love seeing the frozen Athabasca Falls, it's so huge and it's the only time you can walk in the Canyon at the bottom of the falls of such a powerful river.