I have not been to GNP Canada but we were in Banff and Yoho in 2015. I think the views are a little better in Canada than Glacier USA but the hiking is a lot better in GNP USA. We did 4 day hikes and I would rank them as follows: 1. Lake O'Hara As Selkie said, you have to make your bus reservations ...
We asked for one when we made the reservation and it was in the room both times. 2 twins and a cot.
I believe their exact words were that we could have one if it is available. Turned out well so far.
Lake O'Hara is one of my all time favorite hikes. Just a beautiful place.
Better make reservations for the buses as soon as they become available. They sell out fast.
Here is a video I made from 2015