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)

I think the comments I saw on ltt's review video(here: https://m.youtube.com/watch?v=2NfvzoDpcSM ) is that you don't. Since people point out the king kong 2(and pro) have input latency and their face buttons aren't at the same build quality as first party one.

Input latency(or variance of it) alone would not sit well with me.

I guess you just don't? 8bitdo also comes with a kickass charging stand and their remapping software is kinda nice.

And you can get Xbox style face buttons set for it

The only things I don't like about it is not being able to have analog triggers and gyro simultaneously, and you can't map Star button to anything useful in Xinput mode.

Also keep in mind that there's 8bitdo Ultimate and there's 8bitdo Ultimate Bluetooth, only the latter comes with Hall effect sticks