Hehe, my bet goes to Lara Croft or Snake. Even if this 4chan w/e rig is taking place, once B&B or Duke comes up against someone as popular as Snake, the sheer weight of Snake's popularity will crush Duke or B&B. In any case, as a fan of B&B, I shall support him until the final, where then it shall depend on who's on the other side.
Heroes I support are: Mario, Lara Croft, Cloud, Ah! The Freeman..., Snake, B&B and Pac-Man. Of all those B&B, Lara and Snake are my toppest ones, with Snake being the number 1 favorite for me.
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