Thinking about it, despite Whyte only really having a left hook, I'd say Inoue's is better. He's mastered it, he twists into it perfectly, gets excellent torque, goes upstairs and down, can lead and counter ect ect. It's just excellent but it's not his only punch, so it's not talked about as much.
You know what.. Yes old as **** now.. But I'll happily throw nonito in... I still think he has possibly the best left hook on boxing even at this stage in his career
Dillian hasn't got the form/technique to have the best hook. See those povetkin vids for form, a thing of beauty, textbook hooking right there.