The Nintendo Switch’s controllers shouldn’t work as well as they do. That might be why options beyond a Joy-Con in each hand (or the Switch’s own Pro controller) are few and far between. 8Bitdo‘s latest wireless peripheral, the SN30 Pro, might be worth considering for your secondary controller needs. Beside that allure of nostalgia, the SN30 Pro particularly shines with older games and tries to balance a classic design with modern controls. I picked up the (obviously prettier) European / Japanese model, the otherwise identical SF30 Pro, and had a play.
Source: 8Bitdo (Amazon)