There is no comparison - in terms of musical talent, Dre is lightyears ahead of Diddy. Nobody is arguing against that. But Diddy just put out a fresh-sounding, innovative album, and its strengths far outweigh its weaknesses.
In terms of persona, presence, and passion, Diddy is superior to Dre. They both look at music from different angles - Diddy has always been about putting people on the dancefloor and venting about his personal life, and Dre has been about creating sonically superior, cutting-edge art.
I am not telling you how to live your life, but taking a listen to "Press Play" with an open-mind may be something you thank yourself for doing.