The answer to 'which is better soffit or' is that both soffits and fascia serve important functions for your home's roofing system, but the better choice depends on your specific needs and preferences. Soffits are the horizontal panels that cover the underside of your roof's overhang, while fascia are the vertical boards that run along the edge of your roof.
Soffits provide ventilation for your attic, helping to regulate temperature and prevent moisture buildup. They come in a variety of materials like vinyl, aluminum, and wood, and can be vented or unvented. Fascia, on the other hand, provide a clean, finished look to your roof's edge and also help support the gutters. Fascia are typically made of wood, vinyl, or aluminum.