HORI Nintendo Switch Split Pad Pro. Would recommend. Fit so well in normal-to-large sized hands.
It is hard to explain but these are solving a problem I didn’t know existed. Playing with the joycons didn’t feel... bad. Just... slightly claustrophobic? With these I feel less anxious and cramped when playing a game.
Downsides are they aren’t powered, aren’t wireless, and don’t have vibration. As such they can’t be used as a controller when disconnected from the Switch and they will drain the Switch’s battery faster because they have to be powered off of it.
Small price to pay for comfort.
Picture of Dog A playing Switch, for your time.