Yeah whoever said "brighton", was wrong, haha but seriously get the bird/alta pass you can ski between the two resorts and after a storm pretty much chase openings of new terrain at either resort for freshies. The only advantage I could see to getting an Alta/brighton is when they close one canyon you can drive up the other and ski. But realistically it will only save you a couple times in the season.
I was never really impressed with brightons terrain, the backcountry access is shared with Alta on the southeast side anyway. And whoever said snowbird was overrated was so full of shit, snowbird has such gnarly terrain, they stay open months later than any other Utah resort (at least on weekends) They have a high-speed tram, they have a decent park, fair amount of comps, the tramdeck is fun to chill out on, exc.
If you want to ski Brighton just buy night skiing passes you can get them 2 for 25$ most weeknights with various vouchers (like radiostation keychains) Inevitably you're gonna try all of Utah's resorts and make your own descision but little cottonwood has EVERYTHING, steeps,park,pow,bc,later season, more vert, more terrain.
We pay our debt sometimes.