Elvis has a much greater cultural effect, but MJ was more musically revolutionary and just a better artist all around. Not to say that Elvis wasn't a great showman and musician, but Michael was a genius. Something special. I really appreciate Elvis, but to be honest there were contemporaries that fought in his weight class. Johnny Cash, Chuck Berry, Jerry Lee Lewis, Buddy Holly, Fats Domino, Ritchie Valens... Basically no one was on MJ's level in his time, maybe Prince or Madonna.