I have the Aurora, the Titan, and the Loot N Scoot Package (Cutlass with Dragonfly).  I got to say that the Penguin is a real favorite of mine.  While I wll agree the Cutlass brings a lot to the table, it also costs a bit more to operate.  With my Titan, I get some firepower, some storage, and not a lot of credit to refuel/repair.  Even if it gets toasted, it's only a 6 min or so insurance wait to claim. 
RIght now I use my Aurora as a taxi to get from Crusader area to the outer planets, use the Avenger in drug runs around Crusader, and keep the Cutlass around Hurston/ArcCorp for trade runs.  Out of them all though, the Titan is my fav to fly.