Recently purchased a green Crimson Trace Laserguard for my Glock 42. I have several red lasers on 2 other small autos (keltec 3AT and Sig 938) as well as a Model 36 S&W. I was vEry pleased with the results of the green and found it easy to see and felt I was more accurate than the red laser. After a few dial in tweaks, I tore the center out of target at about 20 ft.
The green Showed up well in daylight too when I took it outside. If you have a small frame carry gun and older eyes like mine, I can highly recommend a laser regardless of color selected. I think you will find it very satisfying and it will make shooting a small frame gun more enjoyable IMO.