Honestly, a good CRT shader is a real game changer for emulation. Many emulators have the ability to add a mesh grid over the top of the image, but this is just about the worst way to try to emulate a CRT; It doesn’t actually emulate CRT pixels, and the black grid laid on top of everything simply reduces the overall image brightness.

For an example of a good CRT shader, consider looking into CRT Royale. The benefit to a shader is that it’s actually running each frame through a calculation before it reaches your screen. So it is actually able to emulate a CRT properly. Shaders can actually emulate the individual red/green/blue pixels of CRTs, emulate the bloom around white text, emulate the smearing that occurs with large color differences, etc… It really does make old games much more pleasant to look at.