I'll always be a fan of Edgar just because of his 2nd and 3rd fights with Maynard. He has been less exciting lately but he may be using his wrestling more because he knows he's already taken a LOT of damage in his career and has decided to fight safer/smarter rather than trying to be more exciting.
He's as tough as any MMA fighter I've seen and I think he'd give Conor a LOT of trouble. He has an amazing chin, his wrestling is fantastic, his striking and footwork are really good and his conditioning is world class. He wouldn't gas against Conor even if he gets nailed with tons of body shots because the guy is just stupidly tough and I've never seen him gas.