MM+ vs RG34XX for 4:3

Hello, I know that there are some websites out there that show the screen sizes of various devices for specified systems with integer scaling on vs off, etc. I just can't seem to find a good site that will do side by side comparisons of a MM+ and RG34XX.

Almost every YouTube reviewer is saying that the RG34XX is bad for everything other than GBA. I'm wondering how close is it to a Miyoo Mini +, which is my current daily driver, in dimensions for 4:3 and other non-3:2 content.

Has anyone made the switch and if so, how is the experience?