Here I show mClassic using Retro Mode (blue light) with the Retrotink 2x Pro and its features.
In this video I'm using A/V and I think it looks okay. Sure better cables make better picture.
Do note that to get the best picture you'll need better cables. The other issue involved with that is that some SNES models have issues with noise do to its APU chip. Which is why I have to use A/V cables.
With that being said you can get more information at Shmups Forum with the following link: https://bit.ly/3Hi1HlC
So RGB, Component and S-Video have this problem.