Kayneth is the better mage of course, but I was talking about portrayal, not saying Tomiomi was actually stronger. Tokiomi goes in prepared and, as forumghost said, wrecks Kariya. Kayneth gets outplayed by Kiritsugu on three separate occasions (hotel, mansion, geas scene) because he underestimated/didn't understand him. Since Tokiomi had the better showing he comes away with looking more impressive comparatively.