Michael Jackson or Elvis Presley  

Incomparable. Different era, different music and different genre. Cannot say Michael Jackson since I belong to his era. That would be unfair to those Elvis fans since I cannot comment much about his music since I know less about his era.

Elvis, the original king, of course!
You'll probably get alot of Michael answers because of his recent death but Elvis will always be the King of Rock & Roll.
Before Michael died, he was rarely mentioned before this unless it was something having to do with court issues or jokes.
Elvis wasn't accused of what Michael was accused of and he will always have the tie to it no matter what.
Since they both died from drug overdoses, they both seem to be really bad role models.
I wish they would actually let the dead men be dead and let them rest in peace!!