Two slick boxers with a fair amount of speed and tricks up their sleeves. At the end of the day, I think one of them was just better at it than the other.. I'm going with Ezzard Charles.
i'd go with charles too,in my opinion he's tops for light-heavies. he wouldn't have all his own way with conn though and as we all know ,billy liked a scrap. charles by decision !!
I think Charles has too much all-around, plus was bigger and stronger at his peak. I give him the edge.