Because some people would rather have the game and go after the girl they want, while as others would rather have girls in general chase them, but that doesn’t mean that running WANTED will make the girl YOU like feel like chasing you, however, PS would teach you how to get her to like you.
It also depends on what type of a person you are, let’s say if you’re really attractive but lack game or sexual confidence, then PS would be better for you and help you with that, but if your game is top notch and your issue is your self-image and feeling like you’re less attractive physically, then WANTED would be better.
Both lead to similar end goals, however, one leads to getting girls you want to CHASE, while the other leads to becoming the one who’s getting CHASED.