While I don't commute out of SEA, you may want to consider a couple things. First, download the ALPA app to see how many commuters you compete with to each base. I honestly don't know if the app counts all ALPA commuters or just DAL commuters. I'm all but certain it doesn't include FA's. So, with that said, consider that LAX is a FA and pilot base for just about every airline out there. You'll be competing with a lot more people than SLC most likely.