Kiniro no Corda: Blue♪Sky

So, while one may be more tragic and the other gives you the fuzzy warm feelings, both anime are centered around music and have a very cheerful heroine that tries their best.  

Both reverse harems. Both have cute female protagonists with many handsome guys. Both have a musical theme. Both have some sort of obstacle in the way of the main characters goals.  

-reverse harem -bishounen guys -share similar voice actors -based off a game 

-Both are about music -Both are reverse-harem 

Both are about orchestra club, who are competing against other school to know who are the best of all. Hibike! Euphonium is about brass and Kiniro no Corda: Blue♪Sky is about classical which focus more on romance.. 

Reverse anime series currently airing now. One series involves Gods while the other music. Both have bishies who fall in love with our main heroine. Familiar voice actors can be heard in both series.  

i choose Love Live 2 because this season was going to be focus on Love Live where all the idol club in Japan will be battling with each other to know who is the best of all, just like Kiniro no Corda: Blue Sky battling against different classical music club and become the best, and the only different is the character personality and the music genre...and i love the music of both :D