At first, DOA6 when it came to the SSA. That is until the meter usage for it ruined some type of evasion, so can't pick either currently. But in terms of character inclusion and content, DOA5.
DOA5 for sure. I enjoyed it a lot more than DOA6. I continuously played it and its other versions for years and passionately discussed it here for just as long, DOA6 I dropped after like two or three weeks after release.
But in terms of character inclusion and content, DOA5.