Random poll is random...personally, I would probably pick spelling, even though I'm not as good at it as I used to be. ^^;
Theoretically, I could be pretty good at a vocab bee, but with the way my mind goes absolutely blank at the slightest provocation, I could see myself standing there going "Umm, uhhhh...* snaps fingers * wait, I know this word...it's um...when you do the thing with the things..."