The question now (and the tip I'm asking for) is if I should go for a updated sysNAND or continue using 9.2 sysNAND + emuNAND 11.0.
Go with updated sysnand. It's a space saver (no Emunand partition) and you'd have to make more backups with an Emunand. With updated sysnand you only need one: your sysnand. It's perfectly safe. Also, you don't need to double install GBA games and the like, because they need to be installed to sysnand to load (sys + emu if using emu)