This question is especially for those who don't have English as mother tongue.
regular movies or shows I like to watch in German. usually I'm a fan of English but it's just easier to understand and the syncronization is good.
animes however I like to watch in Japanese with English subs 👍
the German synchronization is usually crap and they are often cut and more often than not I don't like the English one either
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The german synchronisation is definitely one of the better all around, so I prefer watching it german as well. Also agree with the anime aspect - bar a few exceptions (Samurai Champloo has a great synchronisation).
TV shows the few times I watch them I prefer to watch in the original, because the synchronisation effort usually is quite lackluster.