Subtitles were MUCH better..
At a friend's birthday party, my friends and I had rented the dubbed Sailor Moon R and S movies from our local movie rental store. Already owning the subtitled R, S, and SuperS movies, I could tell there were many many differences. first of all, they could have done better with the outers' voices. The dubbed movie was exceptionally good with their attack names and the edited stuff--there wasn't much missing. If you want to experience true anime, I'd get the subtitled movies. If you're a bit younger, and aren't aquainted with cursing or partual-hentai, get the subtitled movies.