I didn't like the fact that for the "pc-setting" in the 8bitdo you have to use the dongle, and can't use bluetooth.
also the kingkong2 pro has exchangeable abxy buttons, so you can change them to the correct layout for the thing you're currently playing on (which may be extremely useful with the little brother, depending on his age)
Not with the Pro 2 at least ^^ I connect it up and press the profile button and it works.
One thing I did not like was that I could not map the back buttons to other keyboard presses, just default buttons already on the controller. But might have been mistaken in that.