The best costume is definitely the one where you don't pay 20 bucks for fucking campaign missions.
So $20 for one new mission pack and four skin packs. . . that don't add extra content. . . that seems like a lot // For $20 you'd expect half a new game
Also, if I was to choose I think I'd go with the Gotham by Gaslight skin
This season pass is bollocks...not buying any of them...
As far as my fave costume, I'd have to say Knightfall, just b/c it is so different.
But yeah...I am waiting for the Ult Edition to come out for $40 bucks, b/c they already screwed me out of my money on Arkham City.