I actually voted Ryo. That fact that there is no "bad ass" in him but he still gets out there and fights is really admirable in my eyes. Plus, I love comedy, and Ryo makes me laugh pretty often. It doesn't hurt that he's 4 super sweet Riders wrapped up into one, either.
I also really like Tendou and Hibiki -- Kabuto and Hibiki were the 1st Rider series I started watching, so in some way they are the archtypes by which I judge all Riders past and present. I think they exemplify the two crucial "lead types"
On one hand, "the bad ass" and the other "the true hero" and they do both better than any, respectively.