We flew a search out of Banff using the parks office, and shortly moved our base to Canmore. While in Banff, the Parks guy told me about the strip. His attitude was that it is a private use airstrip for locally based aircraft only. He gave us permission to operate there, but without fuel or security it wasn't appropriate.
I'd be sure to ask permission before going there. For the conference, ask and we may receive.
I've flown around, worked, and been a tourist in both places. I vote Whistler. As much to do in any area, but in Whistler everything is closer, and the weather will probably be more enjoyable. Could be wet and foggy, but Banff will be cool to cold.
Matthew.