Alright, so we have a tie going on right now...
I believe it's because they both have a LOT of Fantasy/Supernatural substances set in a modern age time frame. I also know that there are a TON of different Harry Potter roleplays on this site (mostly with people having OC characters), although I'm not so sure about The Dresden Files and how popular that is around here.
I'd just like to refresh your minds and state that this will be a smaller group playing Canon Characters. The tone of the game will be on the darker side. It'll possibly be in Extreme, although the characters will still be human wizards/witches/warlocks, (yes I threw in 'warlocks' to be an umbrella term for Herm/Trans.) There won't be any real system, just unfolding events that push the story along unless
you'd like to roll for a bit of randomness/twist every once in awhile.
I'll keep the poll up for another week or so to break this tie, hopefully.