Scourge is 300 years old, Khan is 300 years old. Scourge is physically enhanced via alchemy, Khan is physically enhanced. Scourge betrayed a few peeps, Khan betrayed a few peeps. Scourge doesn't feel pain, Khan is highly resistant to pain.
I think it's pretty obvious. Scourge absolutely massacres in about two seconds with the semen amp he gets from Quan's groin.