My 3120 cuts faster than my 2100 in any wood that I've tried so far. I've only had the 3120 for 2 months now but its just obviously better at milling. Milling is a big load on a saw and I don't see any advantage to a smaller saw. Maybe small softwood would be an exception and a small saw might keep up with a big one in a 12" spruce. I don't cut anything like that.