Neither is better, it is just what fits your lifestyle. Some people perfect the ease of simply folding their prefold into thirds, laying it in their diaper cover and wrapping it on their baby. The main benefit to this is that it puts the most layers in the "wet-zone". Others prefer using their favorite fold (angel wing, bikini twist and jelly roll are some popular ones) and using a Snappi or diaper pins to close the prefold before putting the diaper cover over the top. The main benefit to this technique is that the often explosive newborn poop is contained in your prefold diaper, allowing you to get more use from your diaper covers. Either way, the newborn poop should not escape from your diaper covers with a proper fit.