Manga vs. Anime

Okay who else thinks it weird how diffrent the manga and the anime are I mean it woul be okay if Keita as with the same guy in BOTH of them but he isn't! Which one is better?? I really cant decide cause i own both the anime and the manga. Whose a better couple KeitaxKing or KetiaxKazuki?

There are 3 versions of the manga
KeitaxNiwa (king) - Link
KeitaxNakajima - Link
Gakuen Heaven ~Calling You~ KeitaxEndou - Link

And I Like the Manga more than the Anime, its based on the game so thats the reason each manga has a different outcome ~
Nakajima has the whole evil hotness thing going plus he wears glasses, i just didn't like how they made Keita out in his version of the manga otherwise it would have been perfect
I still like the kings one but meh, there are other pairings I'd of liked better, I need to buy the endo one, but cant seem to find it on amazon

The anime was awesome but still i like the manga and games more, that probably makes me strange

I wish they would stick with one couple. I own the anime but not the manga. A friend let me borrow it. Personally I always liked the KeitaxNakajima pairing. Still overall the stories are cute!

I prefer the anime, but personally id love to see more of IwaiXKoji pairing