I'll definitely have to go with Soul Calibur. I personally feel they have deeper and much better balanced fighting engines than the DOA games. I also feel the same way about just about every other fighting game. I think VF4, Tekken, Street Fighter, and just about every other fighting game I've played in recent years has a better fighting engine, and was more enjoyable for me than any of the DOA games. And this is coming from a guy who killed many hours with DOA2 back when the PS2 was launched.