I've largely settled on this ROM for now. Works on the H and Plus models:
https://github.com/rg35xx-cfw/rg35xx-cfw.github.io/releases/tag/rg35xx_plus_h_batocera_20240306 - Batocera V40 Beta.
Everything is very well configured out of the box and very fast. MuOS is too basic for my needs so wiping that sd card.
leaves me with
64GB Card 1 - Batocera V40 beta and my Content - fast NES, SNES, PS1 performance with many tinkering options.
64GB Card 2 - Stock Anbernic OS with their Content - fast NES, SNES, PS1 performance, with too much content loaded that doesn't work. Tinkering is more hassle and limited.
64GB card 3 - will probably load MOD3, the stripped down official OS and load my own content
512GB card 4 - empty and probably a waste of money, unless I buy a more powerful handhled
Fell down a few reddit and youtube rabbit holes yesterday and wasted about 4 hours reading and watching stuff related to "batocera", "tiny best set", "Anbernic MOD3". Today I will try to spend more time playing then tinkering and reading!
rp2000