It will be Ikon based and goign with at least the Plus or the Full pass won't be a bad idea.
As an FYI, many ski area season passes only allow Ikon add-on to the Ikon base pass. This is true of both Alta and Snowbird - whose passes are not cheap and provide a decent discount on the base pass. Not possible to add a Plus or Full, you have to buy either separately. This also used to be true for Schweitzer, but the economics have changed since Alterra ownership was finalized. Now, makes sense to use the full Ikon as your Schweitzer season pass. (I assume the Ikon add-on to a season pass only applies to resorts on the Ikon pass, but not sure of that.)
If an area is also on the Mountain Collective, they typically offer a Mountain Collective partner discount on the area on the season, 50% off lift tickets at any MC resort. So an Alta or Bird season holder could ski 50% off at Taos, Aspen, JHMR. But 50% off is still expensive for a ski week.
I realize there is not much you can do about it and I'm guessing season pass holders are a minority of participants. But does complicate Alta, Snowbasin, Aspen, Taos, JHMR gatherings for some.
You, Trish and the Minks are lucky. Mt. Rose season pass is dirt cheap, and full Ikon purchased separately is reasonable, esp given how much youse travel. Add 700-800++ to that, gets to be a tougher decision.