What is wrong with these people? I think TMZ is asking "Who would you rather fuck," which is... well, ew. What a charming regular feature!
Look, neither is bound to be much fun, but for the sake of comedy, I'd have to go with Callista.
Elsewhere! Would you like to read an error-riddled yet by-the-numbers "Meet Callista" article from the UK? I honestly don't recommend it, but if you must, here it is.