(Upon reading the title, somebody’s uncle’s head just exploded.  Sorry about the carpet, ma’am.)
1.  Of the four rappers in this discussion — Run, DMC, Pimp C, and Bun-B — the dopest emcee is Bun.  He could cover more ground than either of the boys from Queens, rap with as much force as power as Run, and had a better knack for depth and political commentary.  Ask yourself — what could Run and DMC do that Bun couldn’t?  Then flip that around.  Hard to say Bun can’t do more.
2.  UGK stuck around way, way, way longer than Run-DMC.  Think about it…Tougher Than Leather came out the same year as UGK’s first tape, The Southern Way (’88).  By ’93, Run-DMC was gone.  In 2009, UGK dropped a record as good as anything they’ve ever done…and it’s posthumous (for Pimp C) banger #2.  They’ve stuck around long enough to rap with two generations of emcees that were influenced by them.  In rap, that’s astounding.
3.  Pimp C, the musical genius.  Run-DMC’s best work was done with Rick Rubin.  Pimp C was his own Rick Rubin, with a particular gift for music theory and working with live instruments.  And he sang lots of his own hooks.
4.  UGK’s music was more evocative.  Tell me the Run-DMC song that resonates emotionally like “Hi Life.”  And that’s just the one I picked.
5.  UGK’s got a stronger catalog.  Run-DMC’s got two records even Run-DMC fans don’t want to listen to again (Back from Hell and Crown Royal), and one they were pretty disappointed with (Tougher Than Leather).  There’s not a wack UGK record.  There’s not even a bad UGK record.  And each of their seven albums is distinct from the others?  Game — blouses.
6. UGK did this without the advantage of being in New York.  If UGK is from New York, who would argue against them being automatic members of the Rock ‘N Roll Hall of Fame?  Put Run-DMC in Port Arthur…do they get as big as UGK has?  Probably not.
7.  UGK did this without the promotional push Run-DMC had.  This is sorta corollary to the point about New York, but think about this — UGK’s first video, if I recall, was “Take It Off.”  That’s, what, ’99?  Or, put differently, 13 years after “Walk This Way?”  Ridin’ Dirty going gold with neither a single nor a video is nearly as impressive as the success of Raising Hell.  Not as impressive, mind you.  But nearly.
Tell me what you think.  I leave you with a link to what might be the two best rap groups ever, with DJ Paul and Juicy J on the track.  I’m using the Sims version because you can’t embed the real one.  Best I could do.