I made the mistake of installing Kubuntu 24.04 when I wiped Windows off my gaming machine. I regret it. It's not SO bad, but I don't like having Snaps shoved down my throat. Otherwise it's OK. And you still have great support online and tons of documentation.

The best alternative in my opinion would be Arch via the Endeavor OS distro. It's easier to install than standard Arch, it has an increasingly large community, awesome documentation (Arch Wiki), and is packages are up to date. And I think it's a rolling release? (Correct me if I'm getting)

Otherwise if you want stability, I'd suggest Debian stable. They just released a new stable version not too long ago so it's not too outdated. It's incredibly stable. However, over time the software isn't updated to the latest releases for stability's sake. It takes two years before they release a new version kinda like Ubuntu LTS.

Edit:

I should add that with flatpaks you don't really need the latest and greatest packages in your distro anymore. It's not really a big deal if you're not on the latest GNOME or KDE Plasma. It still works fine. Application wise you can get all the latest apps on Flathub anyway, regardless of distro or how outdated your Linux is.

If I need to reinstall, I'll be using Debian (stable). I don't want any hassle.

I’ve quite enjoyed Tuxedo OS on my gaming rig. Worked right out of the box with every game I’ve thrown at it with my Nvidia GPU.

I've been pretty happy with Garuda Linux, Arch based. You'd be fine with near any of them though. Fedora base is amazing and stable and as well as the Arch based systems I use.

In the end it comes down to your hardware and what kind of gaming you want to do.
AMD gpus seem to work the best next with Intel GPUs. Nvidia can certainly work and be stable but has some drawbacks with Wayland from what I remember. (Maybe have been fixed?)

Anticheat is a crap shoot sometimes

There isn't "a best" exactly.

There are some things to consider though.

1. What hardware are you using?
2. Are the latest Video Drivers available for the distro you are considering?
3. How much configuration do you want to do?

Its a nuanced question. There isn't a 1 size fits all approach to this.

For me, going Arch was the move. It fit my usage habits.

I used EndeavourOS for about a year and a half with no issues at all. Currently testing Nobara as I wanted to try something different. Again, no issues at all.

I use Zorin OS, which is based on Ubuntu. Never had to set anything extra up, just installed Steam and everything worked.

Just my opinions as I am still a Linux noob (been using it on and off for the last 15 years, but only on old hardware, and I made A LOT of mistakes):

Handheld? --> Bazzite

Desktop? --> openSUSE Tumbleweed