Vice Admiral/Lieutenant General Ship Token: Speak with a Starship Requisition NPC to claim a Vice Admiral (Fed) or Lieutenant General (Klingon) ship. For Federation characters, this token can be used to claim an Exploration Cruiser Retrofit, Long Range Science Vessel Retrofit, or Tactical Escort Retrofit. For Klingon characters, this token can be used to claim a B'rel Bird-of-Prey Retrofit, Varanus Fleet Support Vessel, Marauder Patrol Cruiser, or Kar'Fi Battle Carrier.
Actually, the token only works for the B'Rel and the Kar'Fi. The Varanus and Marauder are Brigader General/Major General ships, so they don't fall under the Lieutenant General token.
But my personal recommendation is the Kar'Fi
Was named Trek17, but still an author.
Been playing STO since Open Beta, and have never regarded anything as worse than 'meh'. I have nothing against the game/devs, nor any particular wish to talk bad about either, or praise most decisions. Still, it's better to be positive than cynical.
I would have to go with the Kar'fi - and of course I get the Vet ship too. I don't like switching ships around and I often take my KDF toons into a STF elite. I don't think the B'rel would last very long or be very effective - come to think of it I don't think I have ever seen a B'rel in an STF elite!