 If you liked
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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 ...then you might like
Hibike! Euphonium
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Both focus on interpersonal relationships between high school classmates and feature fantastic writing. Both also have a good mix of drama and comedy. Their second seasons are more alike, as Oregairu's art improves (though of course not to KyoAni levels) and Hibike! Euphonium takes a "case of the month" approach like Oregairu, where the protagonists try to solve their classmates' problems or accomplish a big goal.