M105 is fully SMAT and M95 is half SMAT and DAT. They both cut well and have different characteristics. M105 will leave a better finish but as a very short work time as its a very dry compound. M95 doesnt leave as fine of a finish as M105(doesnt really matter as when you are compound you always need to follow up with a polish anyways) but it much more user friendly. It has a really nice working time as it has great lubricity and wipe off is really easy.