pano: long groomed cruisers, on hill is very family, nice hot tubs, after ski drink specials, stuff for the kids to do etc. Has Taiton bowl, but it is 1000-1500 ft of good and 2000+ ft of blue cat track to the base and then 3 chairs and a walk back up
KH: oppiste of pano: not much groomed, steep, goofy lift system (4000 ft gondola to the top and one other lift that doesn't do that much) Great ski hill in a truck stop, not much on hill, not familly friendly, in town you have "new meat mondays" (just ask around).
Fernie: will be the best skiing on your life or good coffee drinking, If it snows and not rains, it will be amazing, if it rains, or has just rained, it will suck huge. a fernie trip is like high risk stocks. Can be great or you loose your shirt. one hill is a bit slow after skiiing, in town is nicer, but still a small town and a drive to the hill. Best overall bet of the 3 if you are looking for some groomed and some not.
If fernie is rain check castle out too. 1 hour away in alberta
Also check out banff as another trip option. No rain, less snow (then fernie, same as KH, and more then pano) bigger town, more options, 3 ski areas.