I went to Colorado 2 years ago spring break and we stayed in a condo by keystone and got that superpass thing and checked out all the mountains for like 8 days.
Same time/duration one year later we went to Utah we couldn't find a decent condo in Utah so we stayed in a hotel on Alta. We checked out a bunch of different resorts and that costed way more because there's no superpass discount thing.
All in all IMO Colorado was cheaper and better housing/tickets. But I think it depends on your style like if you only ski one mountain the whole time Utah would be cheaper or as cheap as Colorado. And I know it's a matter of timing but we had way better conditions in Utah. Hope that helps.