I would book, since the window for decent airfares might be getting tight.Wait or book?
The current storms that are raining halfway up most B.C ski areas will be all snow in Banff. And since it's not the usual fluff it will beneficial in covering up rocks.
Since you live in SoCal and you have kids, here's the only caveat. Banff is the coldest destination resort region in western North America and you are going there at the coldest time of year. In my 25+ years of Canadian ski trips, I've had below zero F temperatures on about a third of them. Usually it's just a day or two; most persistent case was 6 days in 2018. Two of those trips I took a day off from skiing, and in 3 other cases I would have if I had been riding lifts rather than cat skiing.
If your kids are outfitted for Mammoth or Utah, that may not cut it at Banff. You all need high quality mittens and multiple windproof layers for both upper and lower body. Face masks for the kids would be a good idea too. The odds are better than half you'll be skiing at reasonable temps of 10-15F, but you should be prepared. You don't want to go out your first day and have to buy upgraded clothing/accessories to continue skiing.
After all these years of skiing in Canada, I think the numbers underrate Louise/Sunshine. Yes, Craig Morris in Fernie always made snarky comments about needing Ptex there. You won't be seeing much in the way of a Mammoth snowpack or LCC powder dumps there. But terrain is interesting, skier density is low and snow preservation in that cold weather is excellent. I believe that cold weather also means that October snow sticks around and doesn't melt out like it usually does at U.S ski areas.
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