I’ve been deep in the Android emulation rabbit hole for a while.

RetroArch is a great all-in-one solution, but it can be tricky to customize. For example, you can’t move on-screen controls through any sort of interface, but need to edit a configuration file to do so. It also won’t automatically adjust the controls to the game you’re playing - you would need to manually override the configuration to use an SNES overlay for SNES games. That said, the default “retropad” on-screen controls work fairly well for most consoles if you don’t feel like customizing all of them.

RetroArch is going to provide the most accurate emulation cores for basically everything up through the N64/Playstation. Is it the best? If you take a few minutes to learn how to customize it then definitely. In addition to being accurate, it has a great system for video shaders that work across all consoles.

Outside of that Dolphin is solid for GameCube/Wii. Yuzu is available for Switch but only some games will be playable.