The answer to 'fascia or fascia' is that fascia and fascia boards are both important components of a roof system, but they serve slightly different functions. Fascia boards are the horizontal boards that run along the edge of the roof, while fascia is the vertical facing material that covers the fascia boards.
Fascia boards provide structural support for the roof and help secure the gutters. Fascia, on the other hand, is primarily decorative, giving the roofline a finished, polished appearance. Fascia boards are typically made of wood or PVC, while fascia can be made from a variety of materials including aluminum, vinyl, or wood.