It really depends on the intended use. My 10" will cut a 4X4. 2x6's I have to turn over after a partial cut. If it's for home use, Delta and Sears compound miter brands [chop style] are fine. If it's for industrial use, then Dewalt [slider] would be a better choice. I've just finished framing 900 sq. ft. of basement and have cut nearly 300 2x4's with my Delta 10". Cuts PVC pipe and, if you are careful and go slow, the carbide blade can also cut aluminum plate material. If you need to cut a lot of 6x6, then you'll need a 12" saw.