Square cut a little faster in the cut -yes, but does not stay sharp as long as round due to that sharp corner wearing. Round chain cuts a little slower ( most would never know the différance) but in dirty wood, bark loaded with crud it will out last square ground. This is a chevy ford dodge thing. Do not over do the gullet when grinding Sq. chain with the standard design chain grinders. You do not want a big deep gullet with a lot of top plate over hang and a big honking beak on the corner area. Course the same basically goes for round as well. I sharpen chains for tree services and some other stuff. For some reason most of what they buy is square- I convert them to round as it is much faster to resharpen them that way- I do not get any complaints. On the other hand I have a company with beam saws, for lack of a better term, 8 ft bars, gravity down feed- those machines are picky as an ex wife. Sq works fine in the warm months but when the wood is frozen they have to use Round other wise they are putting a new chain on every other pallet worth. Which is a royal PIA. Sq converted to round on those machines, does not work well. Why I do not know, as we have messed with all kinds of settings. Even some styles of factory sq give problems , so it is not just me.