I've tossed this one around for awhile. You have LeBron who has been to 8 NBA finals which takes you through many best of 5 and 7 games series with two different teams. two different coaches and multiple teammates. He carried most (not all) of those teams on his back the entire way. He did have a real good squad in Miami with Bosh, Wade and Ray Allen. One more thing. He came out of the Eastern Confrence which has been notably weaker than the West the past 10 years.
Tom Brady has gone through 8 full regular seasons during this run BUT he has played in one of the weaker divisions in football. The fruit of being in that division are many first round buys meaning he has had to win one game to get to the AFC championship game. Did I mention the perhaps the most important piece of this run? Elite Elite coaching...um ahem and surveillance. ha
I am a proud Magic Fan, so although it pains me to say it...I'd have to say LeBron. If your on the fence check out the debate on the vid and hit the web poll at the bottom!