Usyk is an absolutely complete boxer/puncher and doesn't have deficiencies against any style. Canelo is not, he looks great against everybody (except a specific style).
Usyk's has one of the best straight lefts in boxing history. That punch is incredible, he doesnt telegraph it at all and it still lands with venom, I don't know how he does it. You just cannot see it coming, with almost every boxer you can see the punch coming a split second before but Usyk's straight left comes out of nowhere.
Canelo. It’s easy to look better technically and defensively at the higher weight classes where all your competition are plodders. Canelo has fought a killers row of champions from 154 to 175.