IDOLiSH7 Third Beat!

Both animes has characters that at this point are well development, also both have a villain that the characters can do nothing about it, and not because their useless or dumb, it's because the villain have an advantage of everyone, in fact you can feel their fear/frustation for that and that makes it interesting. 

Both have many similarities, their evolution as teammates is noticeable at this point as well, and now they have more difficult challenges 

Both have characters struggling with their personal problems, as well both touch some deep/dark themes and their well-handled, i think the most similarity in between is that both got such human characters that you can empathize just by their development which is amazing and satisfactory. 

Both have music as their theme and a lot of tons drama constantly happening to their characters, also in both series the characters wish success in the industry but there's always obstacles in it.