Clearly, The Man is in a different league in terms of quantity alone. 130 threads (not even counting all these polls for the awards) is impressive. Quality over quantity, of course, but I think I'd be hard-pressed to argue that his threads are low quality, and since this is multiple choice, I don't mind putting a tick in his box.
jazzflower92 has produced an impressively diverse range of threads this year, from her usual Final Fantasy hypotheticals to Ebola and Norse Mythology, so I'll vote for her as well.
Lex has made probably the most important threads of this year, discussing the future direction of TLS and covering some of the big FFVII news (like the PS4 re-release). Another tick.
Everyone else on the poll has contributed a lot as well but I think I'll stop there