Disclaimer: Emulators are legal. Downloading ROMs (game dumps) for games you do not own is copyright infringement. This guide assumes you own a physical Nintendo Switch and are dumping your own BIOS/Keys and games.
Emulators often peak after a console dies. Once Nintendo stops manufacturing Switches, physical cartridges degrade, and digital stores close. At that point, Ryujinx will become the primary library for preserving 4,000+ Switch games. Ryujinx
However, it is not for the casual user. Setting up Ryujinx requires technical know-how (dumping keys, installing firmware, configuring shaders). If you want a "plug-and-play" experience, you will be frustrated. Disclaimer: Emulators are legal