The answer to 'difference between drip edge' is that drip edge and gutter apron are both types of roof edge protection, but they serve slightly different purposes. Drip edge is a metal flashing installed along the edges of the roof to direct water runoff away from the roof deck and into the gutters. Gutter apron, on the other hand, is a piece of metal that extends down from the roof edge and sits on top of the gutters, also helping to channel water into the gutters. Drip edge is generally less expensive and easier to install, while gutter apron provides more comprehensive protection against water damage.
Drip edge is the more common and widely used option, as it effectively prevents water from seeping under the roof shingles and into the roof deck. It's a critical component of a properly installed roof system. Gutter apron offers additional protection but may be overkill in some situations, especially on homes without gutters. The choice between the two often comes down to personal preference, budget, and the specific roofing needs of the home.