Neither type is better or worse, however the type that you use depends on your geographic location and your application. It is very important that you choose the correct type for your location and application otherwise you may end up causing moisture problems which can lead to mold and or structural damage. We recommend that laser perforated Ra-flect Radiant Barrier be used in ALL of the southern shaded areas(hot humid climates) shown in the image below. The ONLY time when the non-perforated Ra-flect™ Radiant Barrier is appropriate in hot humid climates, is when it is used as exterior building wrap where it is located on the outside of the building insulation. Most northern states or areas of moderate climates can use either perforated or non perforated radiant barrier. If the non-perforated Ra-flect™ Radiant Barrier is used in the white states (shown below), it should be installed in the inside of the structure.