I don't know the guy that shes up against at all, but unless hes vulnerable to sun... Celestia is done. Not even the show really provides a good idea of what her power is.
That being said, even if its fanbase vs non fans I still think the non fans will beat out the bronys UNLESS it gets posted on some brony site. Even in the thread there are probably 30ish active posters if that. There are some that don't post in the thread but post elsewhere.
I'm voting Celestia because I don't like Bleach. Yay \o/
I also wouldn't know the first thing about either, so that's a good reason too.