>

Yukon Alberta and BC
I should note that you're comparing a couple of small countries to a huge area of North America. Scenery in Canada is quite diverse, and trying to generalize the scenery of Canada is like doing the same for the US. >

Norway is not really small. From south to north is further than San Diego is from Vancouver. This means that climate and nature varies a lot from south to north >

Better is subjective, and affordability/accessibility definitely play a role in what will be better for you.
The scenery is a backdrop for experience. What do you actually want to do? Hike? Why not save and visit Alaska, have an experience there, and then build on that when you eventually are able to visit Iceland? >

I’ve been to both Alaska and Norway. 
I went to Alaska for 10 days in August of 2019. We rented an RV and road-tripped from Seward to Fairbanks. At this point I had never visited Norway, but the area around Seward felt like a very Norwegian landscape. Alaska was by far the prettiest place I had ever visited in North America. 
I spent 2 weeks in Norway this summer. Rented a car in Bergen and drove along the west coast up to Trondheim before looping back down to Lillehammer and back to Bergen. I can’t even pretend that Alaska was anywhere near as breath taking as the fjords in Norway (further inland was not as pretty but I think we were spoiled by starting our trip off with a bang). 
My advice is:
If you have more time than money, visit Alaska/Canada. You can road-trip and even car camp if you’re into that. 
If you have more money than time, visit Iceland (I haven’t visited but several of my friends have and say a week is plenty, but things are more expensive there) 
If you have plenty of time and money, visit Norway. I wouldn’t recommend less than 2 weeks, it can be expensive and time consuming to get there, and everything is more expensive while you’re there. >

So you think Norway is overall more breathtaking? >

Yeah. 
Don’t get me wrong, Alaska was one of the prettiest places I had ever been…until I saw Norway. My brother and I literally would just pull over on the side of the road and stare. >

I'm not saying I have an opinion on which is better, but it seems your opinion is lacking actual experience. Pictures/media can be misleading, and it might be worth actually visiting places and experiencing them for yourself before forming a solid view like that.  
Also, they can be different without one having to be better than another. >

Canada is massive and has a wide range of climates and scenery. Which part of Canada?