Who is the best? Who would win in a battle? It's a hypothetical conversation that hip-hop fans have every day about their favorite spitters. We here at MTV News have a great time debating the "Hottest MCs in the Game" (check for that '09 list coming sooner than you think — controversial!), and in October, Vibe magazine put out their list of the Greatest Rappers Alive. More than 920,000 fans voted on tournament brackets, in which different MCs would face each other in dream ra…