So after a bit I've found out
MMBN 1 - Works somewhat well. Playable at least.
MMBN2 - Still slow - frame rate dips and very slow saving.
MMBN3 Blue - VERY SLOW, especially during saving. Not playable
MMBN3 White - ^^^
MMBN4 Red Sun - Playable with minimal frame dips, only seeing them while saving.
MMBN4 Blue Moon - ^^^
MMBN5 Colonel - Playable, very few issues
MMBN5 ProtoMan - ^^^
MMBN6 Gregar - Not flawless, but very stable.
MMBN6 Falzer - ^^^
I experienced No crashing, and saving the game seems like an issue among all the games that slows down in the process but is fine after the fact.
Also tested
Kirby and the amazing mirror - Seems flawless maybe a frame dip here or there. Can't get much better. No crashes.
Summon Night Sword Craft Story - Very stable with no frame dips. Small graphical bugs inside buildings.
Final Fantasy Tactics Advance - Slowly stable? Ran a long time and during battles is stable. The starting story is very slow and buggy so I recommend having a save ready to port over.
I did run into an issue after re-loading a few games (Battle Network 4,5) that it wouldn't load my saves. So be careful. It's still on the SD card, the emulator seems to not want to load it for some reason.