What is the preferred finishing method to protect the outside corners of finished drywall?

Using corner bead as the finishing method for protecting the outside corners of finished drywall is the best practice because it provides a durable and strong reinforcement to the vulnerable edges of drywall where two panels meet at a right angle. Corner bead is typically made of metal or plastic and is designed to be attached to the corner of the drywall. Once secured, it can be covered with joint compound (often referred to as drywall mud), which helps create a smooth, seamless finish that not only enhances the appearance but also protects the corners from damage during regular use or moving furniture.

Additionally, corner bead creates a clean, straight edge that is visually appealing, ensuring that the finish looks professional. While joint tape is essential for securing joints between drywall sheets and drywall mud is used for finishing those joints, neither provides the physical structure and protection that corner bead does. Similarly, a corner cap might be used in different construction contexts, but it is not a standard finishing method for drywall corners. Therefore, corner bead is preferred for its robustness and effectiveness in protecting drywall corners.