Can you document the difference between atmega version and esp8266 version?

[M-Reimer]

Hello,

I'm planning to mod a GBS board to use it as a scaler for older Nintendo consoles (SNES, N64, probably NES). As far as I know they use either 240p or 480i and at least the N64 also can switch between these during gameplay.

At first I found the solution with the esp8266, but to be honest I don't like the idea that I need to have a webinterface on a scaler. Best case I want to set this up once and then just use it. And I would very much prefer being able to do this setup directly on the device. I would even prefer some kind of "config.h" which gets compiled into the firmware over a webinterface.

Then I found your project which seems to be much simpler. But the question is: Is it as good as the esp8266 version? Can I, for example, also add the clock generator when using your firmware? Is it even worth it to use the external clock generator? Are there other differences I should know about?