Whose Record will Stand Longer: DiMaggio or Phelps?

As I am sitting here drinking a Founders Cerise Ale, watching Michael Phelps fly into the records books a question pops into my head.  Whose record will stand for a longer period of time: Joe DiMaggio or Michael Phelps?  This is a great barroom argument so have fun with it and let me know who you think will be standing tall in the record books for a longer period of time.

Pat