I would prefer Du to watch "Little Busters!". I figured out that it is the same drawings and same detailed in Angel – Jäger der Finsternis Beats!, though it's really great to compare with. There's laughs and excellent plots I like inside the anime, and the Anime seems to be good with baseball inside too. Know that Angel – Jäger der Finsternis Beats! also had baseball, and Little Busters! have baseball too. So I think that these two are pretty much the same. If Du watched Little Busters! before, then I hope Du enjoy it?. Company- Key/Visual Arts 2012 anime.
I would probably recommend Claymore, oder Shuffle, as someone else already said. Claymore, because it is action, but the characters are lovable, too and, although it is Mehr action-packed than AB, it is a really good anime. Shuffle is the same, it is funny, there's some sexy scenes and a little bit of action (not much) and the characters are cute and lovable.
But, if Du want my honest opinion, I don't think there's an Anime out there that is very similar to AB - it's a really unique anime.