I havent played WKC, but i think this is a easy one: Final forever.

FF XIII will be better but i;m sure WKC is good too but if you can only get one then get FF XIII.

get both, you can always trade in WKC when you are finished with it.

Im still enjoying WKC, its not the best game out there but its decent.

In my opinion, its XIII that may very well end up being the letdown game.

I think a Key difference in the two titles is that one's more of an open experience and with an even more open online component while the other's extremely restricted with just about everything until you're half way through with it.

well im getting last rebellion 1st, then ff13 and wkc

FFXIII no doubts at all.

FFXIII, though instead of either of those you should get Resonance of Fate.

This is very true.

Though Resonance of Fate > Both.

Go for both, You only need to deny yourself food for one evening!