Regardless of his technical rapping ability, Kanye is a monster of an artist and everything he touches turns to gold. His impact on the rap game is immeasurable and no single person has had a bigger role in shaping and influencing hip-hop as a culture in the last 10 years than Kanye West. Rappers he sponsors turn into stars, his albums are universally acclaimed, and he consistently is ahead of the game - they're still trying to catch up to 808s and Heartbreak!
Kanye West, hands down, lord of the game.