I'm not sure. Now the moving figure makes it enticing to click on so I don't really know which would be more effective. I would probably target the homepage, but I'm not a viral guru or anything. You could put $10 into a StumbleUpon campaign and see how many thumb-ups you get out of 100 pageviews for each method ($5 per 100 views), assuming that gives you enough data. I stumbled the homepage.