Picard.
I could give a crap about the captain less than I care about living conditions. I am assuming that I'd probably be a generic enlisted person, rather than one of the few top brass (if the ship is large enough to support the idea). So, in order from least desirable to most desirable:
Mal is an aggravating boss, and the ship small, so you're in close proximity to him at all times. Being on his ship would pretty much be like being on a small navy vessel out at sea with no clue where your next meal is coming from. Next.
Han Solo isn't much better. Both are "my way or the highway" kind of guys, and always getting you into the thick of trouble, with a ship that barely space-worthy. But at least Han seemed to be a little warmer and more fun-loving than Mal, in general.
Adama would be alright, if there wasn't that whole "we're constantly on the brink of death thing." The ship is big, like a small town or aircraft carrier. Most folks know most folks, but you can probably avoid the most annoying brass. You could get on with your job and if you were reasonably competent, have a happy existence.
Kirk would be my 2nd from the top choice. The Enterprise was fairly luxurious as far as ships go, and there were always fun things to do for the average crew member.
But nothing beats the Enterprise of Picard's era. Holodecks alone would cinch this choice for me.
