Ruiz has the far faster hands, is more fluid with his combinations and has a great chin. That said, people writing Joshua off as an overrated bum are wrong. He has wins over Wlad, Whyte, Parker, Povetkin etc...all top level guys. He’s got good skill, KO power and big heart. I don’t think he quit against Ruiz, he was just never recovered from the temple shot and was clueless on how to deal with Ruiz’s aggression after he got hurt.
For one, he cannot punch in combination with Ruiz, that’s how he kept getting caught. AJ will have to employ the Wlad Klitschko style of jab, jab, grab. Occasional power punch, but fight tall and be selective with his shots. It’s 90% mental, and seeing how he deals with the first big shot Ruiz lands will probably dictate how the fight will go. I’m still 50/50.