^^^ I agree with that, for a memorable honeymoon lifetime ski trip, Japan rules. And on the skiing side the chances of getting good untracked powder is massively highly. They get much more snow, the locals are way less liekly to ski it and there are far less tourists. Plus Japan itself would be fascinating.
Canada is not really any different to the US resorts. The Rockies resorts around banff are cold and very dry, more limited terrain. Whistler is marketed as very bug, but it is relative to the tiny resorts of the US, it would be classed as distinctly average in Europe. It gets a lot of snow but a lot of rain and everything gets tracked quickly. Revelstoke is famed, but it is fairly limited, lots of competition and good snow is not that frequent either. Places like Big White do a bit better for snow/competition/terrain.
Not that there isn't good skiing, good resorts, and some truth to good snow, but the reality is it is a long way, very expensive and the terrain is way more mellow, resorts smaller and the snow is very dependent on location and by 11am is skiied out. The alps offers about so much more for less money and more convenience, and you can ski fresh tracks a week after the last snowfall if you know where yo look and choose smaller resorts.