Something to look out for with retro gaming is a lot of modern controllers have increased latency, which can be frustrating on games that require precision. Unfortunately, the Nintendo Switch Online SNES controller isn't great in this regard. You can use this tool[0] to check latency.

Personally, I use an original Super NES controller + a Timville triple controller adapter[1], but a more modern controller that I like is the 8bitdo SN30 Pro+. I primarily play on a PVM via a MiSTer, so your use case may be quite different.

[0] https://rpubs.com/misteraddons/inputlatency [1] https://www.tindie.com/products/timville/triple-controller-c...