Ah, the age old perennial question, also known as the "Great Sub vs Dub Debate".
When I first started watching anime everything was on VHS tape and dubs were all that were available from my local video shop* and as I got more into watching anime I was introduced to subs from another source, (no names no pack drill). After watching subs for a while I came to the view that I preferred to hear the original voice actors so now I only watch subs. Initially I had problems reading the subs quick enough, but now I find I don't actually read the subs word for word my brain seems to just 'absorb' the text, I do the same thing when reading books, which probably accounts for why I find it so difficult to read out loud in public.
Ultimately there is no "right" or "wrong" answer to the question and people should be free to watch anime in whatever from they prefer and while I'm a sub only person I object to those who try to claim that you're not a "true anime fan" if you watch dubs.
* For several years I had the advantage of working in London and within easy travelling distance of Tottenham Court Road where there were a couple of large video shops and a specialist Sc--Fi shop all of which had quite large collections of anime tapes and if I searched their shelves diligently I could occasionally find a sub release or two.