There is no comparison here, Foyld is a natural/ 20 mill dollar box office fighter. Chael Sonnen is just trying to get attention, how was his shit talking against Brian Stann or Bisping?
Folyd does not care who you are he's talking and he's real. Half of the shit that comes out of his mouth is ignorant, but he never backs down.
Here is the main difference, Folyd Mayweather is original, Chael Sonnen for 2 years has been going on about the same stuff about Anderson silva. Remember when Bisping said something at a press conference about Sonnen having his chance and tapped? Sonnen remained quiet after those comment. Mayweather you diss him he's coming at you.
Here is another major difference, boxing is dead, but aside Mayweather outsells ufc ppvs by himself. Nevermind his skills, but his mouth does a lot of the selling, people pay to see him lose.