Here is my 2 cents..
...pending on the season and weather of-course:
Louise = long runs, tons of ride-able mountain.
SSV = better feeling snow (more natural), secluded, quality terrain.
Norquay = Seems good for a windy day as it is sheltered. Also if you are too lazy to stray far from Banff as it is really close.
I would recommend riding a day at SSV and a day at LL, pick your favorite and ride there. No hate for Norquay, but you will get a better "big-mountain experience" at SSV/LL.