I had to look up 'prat'. (Kids and their crazy slang!) Urban Dictionary says: Basically someone whos a major idiot, or is delusional and dumb. Acts against logic and thinks hes self-righteous. AKA: Major dumbass. Good example: Percy from HP and from 5th book "You stupid prat!" -- I guess it's a British thing. Anyway, the only thing missing was a picture of Adrien Broner.
Fury is neither smart nor witty. He is funny though. He's getting dropped by cruiserweights and his **** talk train doesn't slow down for a second. Now THAT's what I call funny.
It's hard to say, because you don't know how serious these guys are when they say the things they say. If we took them at their word though, the answer would be Fury. He once said that because he's physically the biggest fighter in the world that he's pound 4 pound number 1. He also said he's the greatest fighter ever and the greatest fighter there ever will be. The list goes on. His talent is nowhere near on the level as he makes it out to be.