I own both but cannot say which one is better.
I always end up playing on my PSP instead because it feels more comfortable on the hands and it feels 'like home' with it.
What I loved about the RG35XX is that the screen is bigger and it saves my eyes, really.
I feel that playing 3D games (MediEvil, Resident Evil 2 on PSX) on it still feels nauseous for me even on this, compared to the Miyoo Mini (not +) which has a smaller screen. Maybe both screens are too small?
2D games are much easier to play.
What I enjoyed with the Miyoo Mini is playing GBA games like Mother 3 which I completed on this console. It felt right. But my eyes would feel tired after an hour, for sure.
I have to test more the RG35XX... Also, with this one, I had charging issues. It was never completely charged even after 8 hours of charging and it didn't last too long.
I use MiniUI for Miyoo Mini and MinUI for the RG35XX to have a similar environment.
It seemed a little easier to add programs like the music player on the Miyoo Mini. Easily, just adding a translation patch in the same folder with the same name made a game playable wth the language I wanted to use.. To my knowledge, I was not able to soft patch a rom with RG35XX.
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Psionic Roshambo:
like a 250 dollar kit back when DDR4 was Intel only