You actually watch anime with Sub titles when a dub is available? I don't understand what is gained ? Am I missing something..
Personally, I prefer watching anime with the original language with subs. Heck, I even watch English-language shows with subs as to not miss anything being said. This is just a personal preference but here are my reasons for watching anime in subs:
1. I find most English dub tend to have an unnatural melodic touch with their line delivery which takes me out of it. When I watched Samurai X back in the 90s, loved the dub version. But when I listen to it now, I don't care for it.
2. A lot of anime have the same English voice actors. So I constantly hear the same voice over and over again which kinda gets tiresome. To be fair, there's also a lot of anime with the same Japanese voice actors. But the difference is I don't understand Japanese, so the novelty is still there.
3. The Japanese language tends to use more syllables or words to convey something compared to English. So in order to match the characters' lips or speech, the English dub tend to use a lot of extra words which seems a bit forced to me.
4. Maybe it's a culture thing but I just prefer Japanese dub in anime because I find the acting more natural compared to English dub. Again, it has something to do with not understanding Japanese, so I can't find anything to critique and just accept whatever they're saying.
5. I'm a fast subtitle reader, so it doesn't take away from enjoying the visuals for me.
6. There's a certain charm or uniqueness to the Japanese delivery that the English dub can't match or convey.