Bones. Julian would make the conversation all about him and Phlox would talk about gross stuff.
Who would you rather ask for shore leave to be with your family around Christmas? Kirk, Picard, Sisko or Archer?
Archer, because he'd probably say 'sure say hello to the family for me' and the others probably would say "sorry you're needed here!"
Who would you rather perform mouth to mouth resuscitation on T'Pol, Uhura or Samantha Wildman?