Rory by a landslide.
It's important to remember WHO Rory was at the time. He had all the skills, the athleticism, the reach, and the nasty mean-streak that makes a champion. A lot of people saw Rory's ascendancy to UFC 'champion' as a foregone conclusion. At the time, he represented a new kind of technical fighter, not just some psychotic tough-guy.
Then he ran headfirst into Robbie Lawler who, for some reason, showed up to that fight looking to scalp his opponent to a degree that was excessive (even for Lawler).
Rory took AT LEAST 5 fights' worth of damage in that scrap. It was one of the scariest things I'd ever seen in combat sports because we all knew that he was taking compounded damage. It's one thing to break your nose in a fight. It's another thing entirely to add 10 layers of physical trauma on top of that broken nose, not including the severe damage his body took.
We joke about fights 'shaving years' off a fighter's life. In the case of Rory/Lawler, it was undeniably true. He wasn't knocked out. His body just GAVE OUT.