The answer to 'roof decking vs' is that roof decking and roofing are two different components of a home's roofing system. Roof decking, also known as sheathing, is the solid surface that the roofing material is installed on. It provides structural support and a base for the roofing. Roofing refers to the outer layer of material, such as asphalt shingles, metal, or tiles, that protects the home from the elements.
The type of roof decking you choose will depend on factors like the roofing material, the pitch of your roof, and local building codes. Common options include plywood, oriented strand board (OSB), and tongue-and-groove boards. Roof decking is typically a DIY-friendly project, but roofing installation is best left to professional roofers who have the proper tools and experience.