Carter has a bit more substance and i'd favor him by stoppage. Could be a good little shootout while it lasted.
Carter had a higher tighter guard, while Mugabi was wide open, Carter punched harder than Hagler, so I feel he stops Mugabi quicker than Marvin did and like he said Mugabi was no middleweight, I`d say most middleweight heavy punchers down the years would stop Mugabi, he was too easy to hit.