This is real subjective for those saying "Punk by a landslide". Personally, I don't care for Punk's shock value, smart ass promos that get big pops off of breaking the sacred fourth wall as the puppets dance along with him, which is why I far prefer Punk's holier than though true heel SES work. I prefer the story winding into the major point style of Funk/Foley/Wyatt, but while Bray is technically very amazing in regards to changing inflection, pause timing (see that debut live promo for that), or really getting into the character, Bray simply hasn't had the chance to show the versatility and hence ability to cut different styled promos, and hence I can't pick him.
It may be cheating, but I'd have to go with JBL. Yes, Justin Hawk and later just Bradshaw debuted in the mid 90s, but the JBL character was so far different from what Bradshaw had done as the rough texan, that it might as well be counted as a whole different person and unlike Hollywood Rock or Rated R Superstar Edge, there werent' any traces of the old Bradshaw to play off of. Outside of Hassan, JBL was arguable with Honest Man Jericho the last true heel that seemed to have zero redeemable qualities or fanfare. Whereas in certain cities Punk was revered and Jericho had some bases, JBL was a heat seeking missle ranging from the Garden to Hammerstein . JBL could get heat off of straight facts and lower his voice, he could shout at the top of his lungs and get massive heat for over ten minutes straight. In terms of making people want to kick his ass, I think JBL at his freshest point might actually give even Punk a run for his money ala being the catayst for Cena being really over his first title chase. . Heck, that ability made an extremely corny feud with HBK actually work with the audience. JBL could go a broadway promo and produce some of his best work ala "In His Own Words"or the transformation promo, or he could give some real effective shorter promos.
Most people dont think about this, but JBL was a hell of a switch hitter in terms of serious quotables and some pretty damn funny, quick witted quips. From "In His Own Words" alone, you got "You can knock me on my ass but I will come back and I will be successful. Come Hell, come high water. Take your best shot, America. John Bradshaw Layfield is right here and I won't back up from anybody. And if you don't like it, you can go to Hell!" as well as "everybody loves free speech until you use it", his quote about destroying himself if it desroys Eddie
In terms of comedy, you got quotes like his quip at ONS when fans chanted you suck dick and he said "I see no women out here but you people chant about male organ now tell me who's the fruit booty!" or "you people get on your internet and share your porn sitees with your buddies and say "we're hardcore". In his own words had "you people are sick because in high school I was the one shoving your ass in lockers and stealing your girlfriend as the successful captain of the football team and not a damn thing haschanged!". Of course, you could keep rolling through the Cena feud and those advertimisements/promos, kicking the illegals out of the border or that beer drinking contest.
JBL as a wrestler on the the stick was as complete of a package on the mike Heyman or Jericho aside post AE as there has been outside of playing a babyface role or winding stories.