Well it should be pretty clear from this thread that there is no straight answer and you have to decide what best suits you and your family. You'll have extreme answers on both sides all day long. "Commuting is the worst!" "You're giving up way too much to leave UAL!" etc etc...
Exhausting.
You applied to AS while already employed at UAL. So, you aren't in love with UAL to the point you don't care about the commute. Have you been using AS for commuting? Have you been interacting with their crews?
I have about six friends at AS. All with over seven years on property. All live in the PNW. All of them work at AS only because they live in the PNW. That's it. None of them think it's a particularly great place to work. Another friend just got hired at UAL and lives in PDX. He's ecstatic.
A lot of it boils down to your personality. Will you always resent the commute like some people? And constantly complain it for half of four day? Or are you the type of person that doesn't mind it and likes the time to watch TV shows on your iPad in the back?
I've done many commutes, 45 minute flights, transons, 3.5 hour drives, six minute drives, to my current two hour drive. I prefer driving, even if 3.5 hours. I hate commuting, not because of "wasted time" (it's only wasted if you waste it, there's plenty you can do on a commute), but mostly because it's just really annoying and occupies too much space in my brain. I have limited space, and enough stuff already annoys me. I don't want to talk to more gate agents and FAs and pilots than I have to. I don't want to look up loads. I don't want to have plan a, b, and c. And I don't want to care about the weather. Some commuters don't care about any of that and are great about just showing up and taking it however it is. I'm not. I love getting in my car, even at 11:54pm, and driving two hours home through NYC.
UAL is without a doubt a better pilot job. If you can accept the commute and not be bitter about it, stay. SFO has tons of great flying and you'll have a career full of opportunities. You're opportunities at AS will be much smaller. Choose what's most important to you.