rios probably as he'd eat all kahn has and in the end land something meaningful enough to put kahn on ***** street. if kahn manages to not get hit, he'd win by ud or even cuts.
Rios is a nightmare match up for khan. rios has a he'll of a chin and has power. his relentless pressure would eventually get to khan.
Khan is a couple of leagues above Rios. He's not a great fighter, but resume wise, he's beaten a lot better fighters than Rios has. Khan would fight a similar fight that Pac did, keeping him on the outside and moving.
I thought about that too but then I wondered about Rios having a better chin. Maidana has been hurt a few times. Tough fight to call. Khan is far more skilled but Rios is a pitbull.