I plan on reading the manga as well, but like you've said, often the manga is better so I started with the anime... I'm not having a whole lot of luck on finding all the chapters scanlated though. I will say this - I find that I prefer the character design of Otani in the anime because he's a little less girly. I'm not a fan of the overly-feminine males found throughout shoujo manga. anime!Otani's still absolutely adorable... just not so effeminate.
It does deviate somewhat from the manga, but not overly so in what I've read so far... but I haven't gotten very far in the manga.