Modded Wii is indeed awesome, I recommend you to check how to improve graphics on modern pannel if you don’t have a CRT TV.
OG Switch modding is great but offline only if you want to be careful.
3DS is indeed awesome for homebrew, I know PS Vita (especially the OLED one) are really appreciated.
PS2 is another great system to mod and with of course the gamecube!
It’s the licence used for the code I guess.