UPS or FedEx at night v. griping pax during the day
I really didn't intend an editorialization in my title, but those are two factors you must consider. Everyone says that boxes don't complain. Also, the benies offered by major cargo carriers are equal to or rival those of the majors. However . . . . you are working at night.

I did it for a number of years when I was in radio, and I hated it.
Another positive, perhaps, for flying at night is less traffic congestion. Others would opine about the great opportunity to fly historic aircraft, i.e. DC-8s. On the other hand, many of these vintage aircraft may not be up-to-date with the latest avionics and glass, etc.
Of course, flying pax is primarily a daytime job, depending on your line. Studies have shown that human performance decreases among those who work at night. I remember that when I worked at night I was sick a lot.
I suppose that meeting FAs is something to consider for the day job.
I think it would be tough decision. If FedEx or Upsco came calling before Delta or AA, I certainly would consider the decision with great care.
Best of luck with your choice.