Charles first, Walcott second. Charles was a consummate technician, could make you lead or lead himself, and punish you accordingly. Walcott is more aesthetic though. That KO of Charles is one of the best counters ever.
Walcott 10/10, Charles 9.9/10 Both ATG counterpunchers. Charles knocked Walcott down with a counter, Walcott sparked Charles out with one.
I'm not certain Charles isn't the best 175lb fighter ever, so I don't think he's deficient in anything. I'd rate them both equally in this category , Walcott probably relied on counters more than Charles but that's just an opinion.
Both 10/10 Charles edges it for me coz he's quicker but Walcotts power was deadly at his size range. Also given prime Walcott probably didn't exist and we can't see prime Charles we don't really know
That's how I see it and it's not even close (on either point), really. I don't see the basis for rating Charles a "9" or a "10" here.