That is a very personal choice, some things to consider though.

Commuting requires-
-finding a crash pad, or a place to rent(extra cost)
-having a second vehicle(you will miss your commute home, and the last thing you want is to be trapped at the pad.
-time away from family or girlfriend(commuting can cause AIDS), you can expect to cut your days off in half just to handle commuting.
-job risk, Trans States has no commuter clause, a miss commute can cause you to get terminated(you will be on probation for the first year from completion of your check ride)

Working for Mesa

-Pay is worse there then even Trans States(though not by much)
-Management cares less about you then the general homeless dog or cat found on road DEAD.
-Moral(sp) at Mesa is lower then anywhere but Trans States!
-you'll be at home on your days off(when not being junior manned)
-low rent(if you live with Mom and Dad-Verrrrry important on first year FO pay!)

Hope this helps