Don't really care for the dub as I prefer sub but it is decent.
English
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I like dubs if they're tolerable. For the few animes I've watch, I prefer to watch them in the language that fits the context of the show (i.e. English for Hellsing Ultimate, which is set primarily in England). However I don't think this could apply to Attack on Titan, where the truest language would probably be some unknown post-apocalyptic mesh of Central European dialects.
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it'd mostly be german though...
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True that some anime have superior dubs ( clannad, yu yu hakusho, hellsing ultimate ) but for alot if anime, native dialogue fits it way better.