Thanks for the trip report @at_nyc - great detail on the faces and how they warmed up!
I agree with what most people have said about Lake Louise having stupendous views - they are definitely some of my favourite! While the snowfall isn't as high as other places, and there are frigid snaps in winter, I would still say that snow preservation on the backside is pretty good. I skied my last day about 10-12 days ago at both Lake Louise and Sunshine and enjoyed the snow quite a bit, despite the unusually hot spring we are having. The conditions 2 weeks ago at Sunshine were mid-May conditions. Sometimes - it doesn't even get that hot in May.
At the end of the day, for AB/Interior BC, I would still have to give Sunshine/Lake Louise a slight edge over a place like Fernie. I've loved skiing Fernie - but of all the days I've skied there, I've only had about 2 decent days. Other days were either raining, or icy or so windy that the upper mountain was closed. I love the terrain at Fernie, but I've had such awful luck skiing there. I'll take less snowfall, longer season and great views!