30 FPS games like Windwaker and Luigi's Mansion are pretty playable the issue comes with other games that are designed to be 60 Fps they just don't feel right or while they appear to run decent the sound is all choppy. I have been testing GCN since 2020 and things haven't got better tbh i heard that on Ubuntu you can get slight better performance because the 2.09 GHZ OC but if the current Android TV build i use to run GCN games on performance mode drains the battery in like 40 minutes i couldn't imagine how that kind of OC would deplete that poor battery.
And if you are just going to play docked or connected to the charger you should just run emulators through Moonshell/SkyNX tbh.
tldr: You can get bad to decent performance on pretty much any build (android/lakka/ubuntu) but your battery will go to shit and most of the times is not playable. If you really want that portable GCN/Wii feel and are at home you should look into streaming from PC.