Original Audio (Japanese) - There are a lot of series with great voice acting, but the one that always comes to my mind first is the Monogatari Series. The whole cast is outstanding, and it has some very memorable performances (Oikura Sodachi in Owarimonogatari, Sengoku Nadeko in Monogatari Series Second Season)

As for the dub, I have no idea. It’s been years since I watched an English dub