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Simplest is Retroarch or Daijisho.
If you really want to get fancy, consider getting one of the cheap handhelds with build-in game controllers, like an Anbernic RG353 or Retroid Pocket.
I second this, especially the RetroArch method. Works incredibly well.
I was going to get one of those, but I have this s22 lying around without getting used. How does the S22 compare to those, power wise?
A lot of handhelds reuse older or lower power chipsets with surplus stock. The S22 should be much more powerful, even if it's the Exynos variant. If it's the Snapdragon variant, it will handle PS2 and Gamecube with no issue, Wii, 3DS, and probably even Switch games (at least what's currently playable on Android).
Just get a good controller. Bluetooth is fine, but if you get something like the Razor Kishi it'll have less latency as it plugs right into the USB-C port. There's probably other similar ones but I haven't used any telescopic controllers in a long time so not sure what's on the market.
The only bad thing I can think of is that since the snapdragon variant is on the SD8 Gen 1 chip, it's known to be prone to overheating on longer sessions, but that's only going to happen with really intensive emulation that pushes it to the limit (mostly highly upscaled PS2, Switch, Gamecube).
There's a spreadsheet that lists the capabilities of the various devices. I don't know where the S22 falls on the list. The devices use cheap chips that are available in bulk, so they generally will be less capable than a current top-end smartphone.
https://docs.google.com/spreadsheets/d/1irg60f9qsZOkhp0cwOU7Cy4rJQeyusEUzTNQzhoTYTU/edit#gid=0
Would you recommend retro arch or daijisho?
I haven't used daijisho. I think daijisho is just a frontend that calls Retroarch, so you're using Retroarch either way.
I like LaunchBox. I use it on PC, and like it for android as well. It can incorporate RetroAchievements too.
Lemuroid is much easier and pleasant to use than Retroarch.