Both. After watching One Piece and its maybe 400 something dub episodes you feel so use to it, but the dubs haven't caught up with the main newer episodes so I'll have to watch them in subs. It really depends on what you prefer from the start. If you start watching an anime with subs from the start you'll be so used to it that you won't switch over to dubs because you think it sounds better with subs. As for me when I started watching SAO dubs when they started on Adult Swim, I was getting tired of waiting every Saturday so I decided to watch the subs and it sounds even way better than the dubs do. I'm currently watching Shingeki No Kyojin for the first time and I can't wait to see what the dubs is going to sound like because I think it will fit the show better than subs. Naruto dubs will grow on you because I didn't have internet back in 2007 and Naruto started to come on in dub on Saturdays.