Tough one for me... I am mostly of the idea that everything is better with the original audio, (I can't even watch dubbed movies) but when it comes to anime I don't mind some latin spanish dubs. I guess I got too familiarized with them, I don't know... they just sound like anime to me
As long as they stick to neutral spanish and they don't mess it up and assign a voice actor who doesn't match the character at all I like it. I watched the dub version of Get Backers first and I got used to it, but I can't really pick one. No idea about the english dub though