I use an OLED HDR TV (LG C1) in Arch.

It is very worth it, even more so with Proton10 adding HDR support for gaming (without needing to use gamescope).

Obviously, if you're going to buy a good HDR-capable display then you're going to want HDR to work. A monitor doesn't need HDR to look good, but HDR feels like a graphical upgrade that doesn't cost you any frame rate.

If you're comfortable enough with Mint, most of that knowledge will transfer over to other flavors of Linux.

I'd recommend something that allows you to use the most current software. Arch, for example. I know it has a reputation as being difficult to install but it is very much worth doing as it gives you a lot of hands-on work with the inner workings of Linux. It will take some time (I think it took me the whole day the first time) but the installation guide will walk you through it.

That being said For most people, I think an Arch install is an excellent project for a VM, or second piece of hardware. For your main PC, you just want it to be up and running as quick as possible so you can keep using it.

EndeavourOS is an Arch-based distro that uses a graphical installer and chooses a decent set of default packages for a desktop PC. That makes the installation of Arch much faster and you're not left to research every little subsystem in order to figure out what packages you need.