I have bought both Warrior Within and The Two Thrones. After a considerable amount of playing and chopping heads, I found that Warrior Within was way better. In the Two Thrones, the prince's dialogue consists of only one thing: whining. Whine, whine, whine all the level long. While having the powers of time and your darker side of you is fun, Warrior Within takes the cake with dialogue, cinematics, weapons, style, gore and boss fights.

I recommend playing the first in the series, than the last however the game is still great