TTT. It has the deepest fighting engine, and the characters are more balanced than in DOA2. Also, it\'s involves more than just counter, counter, fake, counter, high hit, low hit, low hit, high hit, etc, unlike in DOA2.
DOA2 has better graphics, interactive environments, and the tag team is better than in TTT. But I still think that if you are looking for a really fun fighting game that takes skill to master, and also a fighting game that has more than 10 characters, TTT is the winner.