It's no contest, I think Conor and Khabib have the most outspoken rivalry in the history of the UFC (to date). Not much compares to Khabib rolling up on Artem, and that damn bus incident. It's this level of trash talk and 'real' hate that makes the fight more interesting. The loser of this fight will shame their legacy, their ego, their country. Staged or not, it makes for good PPV numbers I guess? Can you name other intense trash talking that comes close to this level? Sonnen vs. Silva? Losing twice to Anderson after all that smack-talk, and having all of Brazil wanting to kill him?