You should focus on the abrasive material type, such as Aluminum Oxide for general wood/metal, Zirconia Alumina for heavy-duty grinding, or Silicon Carbide for glass and stone. Ensure the backing weight (typically C-weight or D-weight paper) is sufficient to prevent tearing, and verify the hook-and-loop attachment strength to ensure the disc does not fly off at high RPMs. Additionally, check the dust extraction hole configuration (e.g., 5-hole, 8-hole, or multi-hole) to ensure compatibility with your specific power tools.