I rank it: 1. Parker (took Whytes left hook and got up like he'd simply slipped) 2. Joyce (took some bombs from Dubois) 3. Chisora (historically been difficult to knockout) I don't rank Ruiz that high, I think his easily dropped but its more so his recovery is good. AJ dropped him with the first combo landed in the first fight and his legs buckled somewhat in the second fight round 1 and 12 after being caught with right hands. 40 yo dustman Arreola dropped Ruiz and also made him do a wobble once or twice with catch left hooks (rounds 2 and 3)
Ruiz took alot of punishment in the Joshua rematch. He won't be quite the same from taking that kind of beating. I think Jarrell Miller and Joe Joyce are genuinely durable guys of the division, and maybe Usyk. He takes shots well for his puny size.
Andy Ruiz would have been right up there if Arreola didn't drop him. Just goes to show, It only takes one fight and sometimes just one punch to completely change people's opinions on somebody.
Anthony Joshua, Tyson Fury, and Deontay Wilder should never be on any list about heavyweight chins unless the list is about glass chins. Dillian Whyte was knocked out by 1 punch by old Alexander Povetkin. Joe Joyce has yet to fight anybody who is a "puncher". The best proven chin is Chris Arreola
Joyce is a beast. While he might be possibly a bit vulnerable to the body i think he could take even a full Wilder Windmill on the chin. So ..... Joyce Wach Parker
Between Parker and Ruiz at the moment. Joyce could potentially but we need to see him against some of the top heavies.