Man, this is a head scratcher. Do want seniority, Quality of Life, or Security?
You most likely can hold a widebody seat at UAL. That's nice. And you'll be Captain in two or three years. And you have passes for you and the family. The G4 job even takes away your Jumpseat privilege.
I would either pick UAL or UPS. Seniority vs. Security. If your over Forty, stay at UAL. But you'll make more Cash at UPS.