I'm a pretty big fan of the Dynasty Warriors series, though I don't like the stagnation of the series-there isn't much improvement from one game to the next, and it's disappointing.
However, I do love the Romance of the Three Kingdoms series the most, because of its attention to detail, deep character development, and ability to create a new, thriving empire from scratch using statecraft and your own wits.
Samurai Warriors...eh, whatever, it's a ripoff of the Dynasty Warriors series, and I prefer post-Han Chinese history to warring states-era Japanese history.