Though if anything, the one in Sioux Falls probably is more grand with its extensions out from the sides of the cathedral.
That makes me wonder, what's the most grandiose church standing in Winnipeg? Probably one of:
* Westminster United:
https://www.google.com/maps/@49.8818861,...Kgl2OywCzvd3Ks64PUbfw!2e0!7i13312!8i6656
* Knox
https://www.google.com/maps/@49.895483,-...Uoh0W3x27Qx3jVwnkNkCA!2e0!7i13312!8i6656
* Sts Vladimir & Olga Cathedral
https://www.google.com/maps/@49.9153228,...1IYDufHLJaW6NOl5aTuNw!2e0!7i13312!8i6656
* Ukrainian Holy Trinity
https://www.google.com/maps/@49.9186315,...W08aSD_-iyX4mpNaeZSwQ!2e0!7i13312!8i6656
Edit: Also, shit tier church of the rock and springers obviously don't count ;-)