I like only subbed animes. Reasons: (Sorry if this will be repeating, but I just give you my own reasons)
1. Dubbed voice actors are terrible.
2. I like japanese language very much, and they are always well-selected.
3. I'm used to watching subbed and when I try to watch it dubbed I just miss those subtitres . And I can read subtitle well, without missing a second of anime action.
4. Japanese is the language, that Anime was created in. Anime is japanese animation after all. And so there are some words that in english wouldn't sound too good..