What to Buy, a 10 Inch or a 12 Inch Miter Saw?- dewalt 10 inch mitre saw blades ,The 10-Incher. One significant advantage 10-inch miter saws have over 12-inch models is that they typically spin faster. 12-inch models tend to spin slower because the blades have a larger radius. Say you have a 10-inch saw that spins at 5000 rpm like the DEWALT DW713. It will run at about the same speed as a 12-inch saw that spins at 4000 rpm.DEWALT 15 Amp Corded 10 in. Compound Miter Saw-DW713 - …You need accuracy from your miter saw and this tool gives you that. The DEWALT 10 in. Compound Miter Saw's precise miter system and innovative machined base fence design offer you long-term fence straightness from additional support. This miter saw is built around a powerful 15 Amp motor that delivers up to 5000 RPM to its cutting blade.