A lot of this depends on which resort you plan to ski and/or snowboard at, how much you want to spend, and if it is going to puke snow or not.

Last season I had 4 season passes in UT- Park City, Snowbird, The Canyons, and Sundance. I spent 75% of my time at Snowbird with a few random day passes at Deer Valley.

Do you want to ski only one resort or many during your x day stay?

If it's going to snow a lot I'd stay at the Cliff Lodge at Snowbird since they close the canyon roads due to avalanche danger. Many a day I've been waiting at the mouth of the canyon very sad due to the powder I was missing that others were taking since they were in the Lodge.

Just my two cents.