You can't really make the argument for either based on one show or even several shows. There are some shows that are much better subbed, and some that are at least as good or maybe better dubbed. Personally if a dub is good enough, even if it's not quite as good as the sub, I'd go with that because subtitles are distracting. As far as I know though, only one anime is widely believed to be equally good if not better dubbed than subbed, which is Cowboy Bebop. Can't cite my sources on that though, so I could be mistaken.