Hagler,it would be similar to CaneloGGG,with Hagler securing the win by KD or even by KO,he simply has a better chin,punches harder,imo,and his stance-switching would probably be too much for Canelo
Hagler wins too versatile too good. Got just as much dawg in him as Canelo probably more. the southpaw ability could also befuddle Canelo.
If Canelo promoter has connections with the judges I'd lean towards him. He would not fight a prime Hagler form ages 28-32.