If there was a universal answer as to what is the best color and intensity for shooting glasses, then they would make only one kind of lenses. Don't buy you glasses out of a catalog. As you know, the choices are many. Like getting a gun, you have to see what "fits" you best under the lighting conditions you anticipate. You need to try looking at the targets your club uses under typical lighting conditions. I find
Lite Target Sun (purple) works best for me.
When I first got got into shotgunning (in the 60s) the choice was less complicated (I worked a few blocks from Bushnell), I got a pair of shooting glasses in green for day time and one in yellow for shooting under the lights. 20-years later, when I got into competitive shooting, it was a different story: most of the skeeters had glasses with interchangeable lenses (
Decot Hy-Wyds). I don't know how many times I've changed the lenses as my prescription has changed over the years.