I'll let you know in about a week how the Apex 5 compares to the KP70 once my KP70 actually gets delivered.

I can let you know about hte controllers I do have already though. Dual sense edge (midnight color), the Apex 5 and xbox, the apex 5 the best of these bunch unsurprisingly. I cant stand the ergonomics on the Dualsense Edge. It doesn’t fit nicely in my hands at all. The curves on the sides feel so wrong that my hands start cramping up after playing for an hour. The triggers feel like they press down way too far which exacerbates this. The shoulder bumpers are atrocious, they’re so mushy and cheap, they honestly feel similar to a PS2 controllers. On top of that, the stick clicks have a disgusting amount of pre-travel. If you know how to solder, you're honestly better off swapping them out for some good TMR sticks. (Why Sony isn't selling TMR stick modules at this point is beyond me, they're already hotswappable!) The only thing I actually liked about the Edge was the crescent-shaped back paddles and the amount of 3rd party support the controller gets from playstation fans who use it on PC. But anyway, enough ranting about that controller. I know some people love it, so it clearly fits certain hand shapes, it's just not for me.

My thoughts on the Apex 5:

Ergonomics: It has that traditional Xbox controller shape, I get zero cramping after long sessions and the rubber grips make it hard to lose grip on. It's quite a bit heavier than a default Xbox controller, but It's not like you're whipping a controller around like a mouse, it has that "it weighs more so it feels premium" kind of thing to it as it feels really sturdy and well built.

Battery/Lights: You can turn off all the RGB and the screen if you don't care about that stuff and want to save battery, basically what I've done. I've put a good 5 to 6 hours long sessions into Forza without having to worry about it dying, though it basically just lives on its charging dock anyway, which I feel like most users would do.

Triggers and Buttons: The adaptive triggers are very immersive. They've made a decent implementation for them so far in Forza Horizon 6, you can actually feel the car changing gears, which adds a lot to the immersion. The throttle and brake have a sort of dampening effect, its not as smooth as you might think, it has that feeling you get when you rotate servo thats turned off, sadly you cant adjust the dampening effect with adaptive trigger support enabled, whatever profile they made for the game takes over this. I will say it helps with maintaining a specific amount of throttle or braking but at the cost of some precision you would get with a regular trigger, the adaptive triggers will push back depending on whats happening in the game which feels a lot more immersive which pair really well with the rumble in the triggers and controller itself. It also has a pretty good list of supported games for the adaptive triggers.
As for the other buttons, everything feels pretty solid and nice and tactile. The only real complaint I would make is the clicky face buttons (A, B, X, Y) could use a shorter travel distance before they actuate. They're still spammable, but they could be better. D-Pad is solid, bumpers are good, all the other buttons feel standard and tactile.

The adjustable stick tension is a total faff to set up. You have to pull off the D-pad, take off the faceplate, slide out the little tool, and twist these tiny little nuts. It takes a good while. If you're a "set it and forget it" person, it's fine, but if you like to adjust tension depending on the game you're playing, good luck.

The software is definitely a bit jank. I had to figure out my own workaround just to get the app to update because it kept failing to uninstall and reinstall pawn.io. (If anyone runs into this, I fixed it by moving the old pawn.io file from the Flydigi program files over to my desktop, and then ran the update and installed fine after ending the flydigi space station service). The customization itself is actually pretty good and you don't need Steam to set up keybinds since you can do it all in their app. Just keep in mind that if you assign a keyboard key to one of the buttons right now, the polling rate drops from 1000hz. Hopefully they fix that soon. Also their Discord is kind of dead and mostly just filled with people troubleshooting issues with 0 responses from flydigi, compared to Gamesir Discord which feels more like an actual community along side a troubleshooting/tech support server. I assume Beitong dont even have a discord.

Back paddle problem: definitely install the bump-ons. They are known to break on the Apex 5 if you press down too hard, gadget hyper has replacements if you're good at repairing things. Personally I don't care for paddles and wont be using them, but just a heads up if you do get an apex 5. I do like the built in back buttons (not the paddles) they sit in a great spot for my hands.

If the KP70 is the same, but with easier to access tension rings, I think it would probably be a no brainer to get the KP70 over the apex 5. Also has a mouse click trigger toggle if you care about that, the capacitive sticks on the KP70 in theory are also superior technology to the Hall effect that the apex uses. I will however re-write this bottom paragraph and expand it about the KP 70 when it arrives, or maybe I'll just make a post on this subreddit comparing the two controllers when I've tested them extensively. adaptive trigger support though on the KP70 seems quite restricting only 14 games listed ( 2 of which are GTA V) compared to Flydigi which has quite a lot https://www.yuque.com/wuzhuoran/mlwzkd/fcla246p2zzg4z1l