Don't worry about getting Guam if you come to CAL. You can't hold it until you've been here for at least a year. It is fairly senior and all they fly there are the 737-800 doing ETOPS to some cool destinations. The trips are pretty much all turns (out and backs if your lingo prefers). I don't know about the cost of living, but if you're single, love scuba diving and island girls, then go there. If you're married and like to live in the 48 normal states, then stay mainland.
However, when they ask you in the interview if what you would do if you got that as a new hire, smile big and say that you'd love it