TOS crew. Kirk/Spock/McCoy would probably ignore me but I'd have more fun hanging out with all the "little people".
Would you rather travel back in time to prevent an attack on a major historical moment (eg a Changeling is about to take the place of the first United Earth leader) or travel forward in time to discover something about your own personal future (eg the person you'll spend the rest of your life with)?
I would rather travel back in time to do something good. I don't want to know what my future holds!
Would you rather be stuck on a planet for a week with Quark, Worf, Odo, or Garak?