I have not used Retrotink due to cost. These are what I have been using https://www.amazon.com/dp/B09WYV2C7K

The NES has RCA to HDMI adapter and it kind of sucks. The video quality is good the audio has a slight background hiss to it. The SNES isn't great either but for $15 it works good enough for now. I do have this ( https://www.amazon.com/dp/B008VWGLXO/ ) on my list of things to get. I will see how that does. Because I plan on hooking the Atari 2600 up to it as well.

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I am constantly looking to see what others are using as well and what they think.