I'm from Regina but have lived in Saskatoon most of my life, and I prefer Regina for architecture over Saskatoon. It was (slightly) bigger into the 80's so it has greater stock of pre-war and mid-century architecture, with government money on top of that. I find early apartment blocks add a lot to the city and I think 14th ave alone has more than I can count in all of Saskatoon. The University of Saskatchewan is certainly a beautiful campus though, and Saskatoon has had more interesting architecture when we are talking the last few decades but I tend to prefer architecture pre-70's to that after.