I wouldn't trust a vote on this. Some voters will have no clue and just vote based on gut feeling and PR. Some will know Python, like it and vote for it based on that. Others will dislike and vote for RoR, without considering what they would do when they hadn't yet learned they disliked it, etc.

Knowing what I know today, I would probably try my luck with Python, as I've too often been bitten by Ruby's lack of properly documented, stable libraries. However, I think I would miss the power of Ruby's easy metaprogramming facilities. Clojure comes to mind as a third option...