The best detective anime ever?

Death Note, Psycho-Pass, Boku dake ga Inai Machi and Monster

The best anime ever is the best anume sver

Cased Closed. The crimes are well thought out. I would say similar to a short Agatha Christie story.

The only one I watched was Conan. I started it because it just happened to be on and I ended up really enjoying it.

Kind of a niche one, but I liked Majin Tantei Nougami Neuro. Can't believe I even still remember that name! Anyway, it's pretty old and tacky, but I thought it was a fun time when I was younger. It's about a demon detective, but it's way more campy and silly than something like Black Butler.

psycho pass is a good dectective anime

I don't know if this is a detective anime or not but death note