Watching movies in English is usually pretty awesome. I like the sound of the english language way more than that of the german language.
However, for a series, I usually stay with the language in which I first encountered it. Animes in Japanase, with english subtitles, series I know from the internet usually in english and TV-Series preferable in german.

Also: Why the heck was this thread on page 3? Didn´t even know of it´s existance. Way to go Qfrat :/