Garak. Worf screams and beats prospective mates, Seven is clueless about dating, T'Pol comes from a culture that suppresses emotion and advocates arranged marriage and I got no idea what Keenser's mini-troll race does.
So yeah, Garak's the best bet and the most stable of them all. Strange.
Would you rather go through a Ferengi bridal auction, a Vulcan arranged marriage or Klingon path to Kal'Hyah(six trials of deprivation, blood, pain, sacrifice, anguish and death)?