There is no list but feel fre to start one, it's a good idea, here is the games I've tested with latest build of both "Stable" and Legacy from astronautlevel's repo :
- Ever oasis (EUR CIA) : Stable = not working - Legacy = working
- Dragon Quest Monsters Terry's Wonderland (JAP CIA with English patch) : Stable = not working - Legacy = working
- Puzzle and Dragons; Mario Bros Edition (EUR CIA) : Stable = not working - Legacy = working
- Dragon Quest VIII (EUR CIA with and without JAP voices Patch) : Stable = not working - Legacy = working
- Zelda Majora's mask (EUR Cartridge) : Stable = not working - Legacy = working
- Zelda Minish Cap (EUR CIA from eShop) : Stable = not working - Legacy = working
- Final fantasy Vi Advance (Injected VC CIA) : Stable = not working - Legacy = working
- Dragon Ball Extreme Budokai (EUR CIA) : Stable = not working - Legacy = working
- Cubic Ninja (EUR Cartridge) : Stable = working - Legacy = working
- Zelda Ocarina of Time (EUR Cartridge) : Stable = working - Legacy = working
Not a very good ratio isn't it ? I'm staying with legacy for now, I have very few play time (familly and job first) so i can't waste it with untested stuff, Legacy branch is a clean Luma (without Rosalia but I don't use homebrew much btw so i don't care) working as expected by a end-user like me, who want to first play games with his 3DS so it's ok, as long as legacy is aviable and until I found a game I can't play with it I have no intention to leave it.