Shootouts by Jadakiss & Styles P. In my opinion, Shootouts is a perfect rap song, incredible instrumental, with the duet style of rapping revolutionized by two of the greatest artists I can name...
But for real this is such a dumb question, because there is no comparing a song from one genre to a song of a completely other genre. Not to mention that there are way too many answers because for the most part, people will not be able to agree on one single song from one single genre as being the best song ever. I think we should leave this question alone and enjoy our best song ever instead, the same way I enjoy Shootouts.