Gaming

Chiming in on the 8Bitdo SN-30 Pro+ (which I think is largely identical to the Pro 2 apart from the new back buttons on the pro 2):

Pros:

• Personally I like the feel more than an XBox style controller. YMMV.
• Solid feel for a rather low price
• Never gave ME any problems with Bluetooth on PC, but everyone seems to have different experiences with pretty much any brand of Bluetooth controller without a dedicated receiver

Cons:

• After 2.5 years of moderate usage, I'm starting to see some light stick drift. I do think I want my next controller to use Hall effect sticks, but if you're the type to upgrade periodically anyways, might not be a big deal to you.
• Rumble motors feel a bit meh?
• There have been times where I've had to re-set my brain to deal with Switch vs XBox button naming when playing on PC. It looks like the KingKong 2 Pro lets you physically swap the button caps easily, which is a good idea IMO.

I can't speak for the KingKong other than that I have a friend who has one and loved it enough to buy another.

I can speak for the 8bitdo Ultimate Wireless and Pro2.

Although the ultimate wireless is the better wireless controller for latency (2.4ghz) and most features (hall effect sensors, ability to wake the switch) - I still prefer my Pro 2. I find the triggers less fatiguing for long sessions of racing games and the controller is the most comfortable I've ever used. Plus, the convenience of having a switch on the back for 4 (though I've only used 3) Bluetooth compatibility profiles is so convenient, it's the controller I bring with me when going to a friend's because I know that as long as they don't use playstation I can use my controller.

The positioning for the dpad on the Pro2 also makes Tetris much more comfortable.

Both controllers are great though, it would probably come down to whichever one was more comfortable in your hands.

And why aren't you considering 8bitdo Ultimate Bluetooth?

As for PS5, I think the only way to use these controllers on it is using Brook adapter (or any other adapter of this type), but it'll only work in PS4 games

I only have the gulikit so I can only give you my opinion on that. The controller feel extremely well built, I like it more than the switch pro controller after some mantainance. I used it for the switch and PC with no noticeable lag on Bluetooth, they do have a 2.4ghz dongle. There are problems with my when I got it. The gyroscope and joysticks need to be calibrated and one of the abxy button slightly binds on press. Have to take it apart and lube it.

As I recall they both have hall effect joystick, not sure about the triggers but I know that the KKP2's triggers are hall effect.

Besides the lack of hall effect sensors, the biggest complaint I've heard about the 8bitdo is the ergonomics. Because of the shape, your sits have to stay at a sharper angle which causes joint fatigue much quicker than the KingKong.

Personally, I own the KKP2 and love it. The shape is exactly the same as on Xbox so if you're familiar with that and like the feel, I absolutely recommend the Gulikit controller.

I’ve reached the point where if a controller doesn’t have back buttons I don’t even consider it anymore. That’s the only reason I haven’t gotten a kingkong pro 2. I have the 8bitdo ultimate and I like it quite a bit, though I haven’t used the pro 2.

I bought a couple of Pro 2s and they didn't work for my use case. Bluetooth controllers are always very sketchy on my computer, so I was trying to use them over 2.4GHz. They were really responsive, but unfortunately there was no way to switch them off of Xinput. Xinput is fine, but it doesn't support gyro inputs. So basically if I was playing a game that used gyro, it was bluetooth or nothing. Ended up being a dealbreaker for me and I returned them.

At the time, there was a beta firmware floating around that had support for what I needed, but I never ended up getting it to work and the 8Bitdo support team said there was no timeline for an official release. YMMV, it could be available now.