Which anime did you like the most? Why?

Damn I've seen around 500 so it's hard to choose but I guess Re:Zero is one of my favorites since the story is unique and they executed it pretty good. [Spoiler:] There was for example that episode where Subaru lost his mind and they tortured Rem in front of him etc and after that episode I just had to take a 15min break to appreciate the deep work behind it and think about it.