Bumping this up after recent chapter. Luffy got knocked out before Zoro was with a weaker attack. Confirmed by Law that he did take Hakai's full force for that momentary block.
Zoro went on with broken bones to use Asura and scar Kaido. Took another hybrid Bagua to finally knock him out (apparently)
Luffy took an advanced CoC full force unblocked, no broken bones (higher durability), forces himself concious through sheer will and then beats the shit out of Kaido and says he's ready for an extended fight.
Zoro partially blocked and was teleported after an INSTANT of a non advanced CoC attack, bones almost broken.
Yeah thats a W for both of them, but I lean to Luffy if you need to rank them.