He's also older, and doesn't have to rationalize the fact that he's dead.
Novel Yuuji was incredibly awesome even without the hax to make him fight Tomogara, since he was really cunning/smart and outwitted a lot of enemies. Like prey evading a predator. Even Alastor was impressed, and so was Sairei no Hebi.
Technically, though, Yuuji's not as awesome as Johann, who was this fucking amazing spellcaster comparable to Lamies who originally developed all the "sensitivity to flames" psychic power Yuuji stole. But then again, Johann had hundreds of years to become what he was and Yuuji became a magic swordsman in a matter of months.