ultimately there's no difference
usually if you watched the subs then go to the dubs it takes about 5 or so episodes to get used to

vice versa it only takes about 10 minutes, but you tend to hear the dub voices in your head

i remember seeing one of the DBZ movies before it was dubbed and whenever i recalled which of the movies i'd seen, i was convinced i had seen it dubbed. lol

but yeah i tend to lean toward dubs because i'm usually doing something else while watching. Thats why i'm so far behind on One Piece