[Suzu]

Dubs are made with varying standards and goals. There's good, bad and mediocre ones out there.

I personally prefer Subs for Japanese media these days, because you hear and see the actual performance (and I happen to learn the language, so Subs are more beneficial in that case). Though, admitted, a good dub can cover up a horrible actor performance in the original, lol.
But then again, dubbing is a work to be appreciated in some form for all the work that flows into it. It's a good service for people who don't speak the original language and just watch their shows more casual too (as in, not having the dedication to keep reading or do stuff while they watch. And of course, some people can't read that fast).

It's personal preference. Even when it comes to what kind of dub you like. Close to the original? Adapted to the culture the dub was made for?