The main difference between an abrasive chop saw and a TCT saw is the RPM. Abrasive saws spin too fast for the metal blades and will wear them out/ damage them quickly. As far as the Evolution saws, the orange saws are their economy model intended for box stores while the blue model is the nicer, higher-end model. We sell the blue Evolutions saws here if you are interested. We have 3 different models to chose from.
https://www.trick-tools.com/Evolution-Saw-Store_842