Again, 15V 2.6+ Amps is the best...
5V chargers are weak and from what I read no matter if they can charge high wattage it seems Switch will be locked at 1.5A with a 5V charger so it takes more time to charge, can't use dockstation and it's not good to play and charge...
If you find a USB C charger 15V 2.6 or more amps buy it, but don't charge the controller's with it.
Ppl also claim those chargers with Power Delivery are the best (again they must be able to output 15v too). However I my self don't trust any of them as I can't be sure they will actually detect the exact voltage that the Switch needs also some report 16v instead of 15v...
Ps: I my self prefer using the original charger and I even wonder why everyone want to buy other charger for the Switch instead of just using the original.