If your AMD card is older than your latest linux distro release it's plug and play, no driver installation required
Wayland works pretty well on most desktop environments too
beware fresh released AMD cards in combination with long term release distros like Debian stable, you most likely will need the driver from the AMD website (not recommended)
the OLED version has a more efficient CPU and fan resulting in a quieter fan noise
if you only play with headphones or only play lesser graphical games like Slay the Spire or Brotato you probably barely would notice the difference though
If you update your Arch Linux system with a kernel upgrade, the kernel modules will NOT be loaded again automatically by default and things like FUSE (used in AppImages for example or other FUSE based mounts) will not work without intervention
Just a little heads up in case you didn't knew:
if you install packages like latte-dock from pacman (or build from source in this case) they will vanish with your next Steam Deck update because the Linux on the Steam Deck works quite different to a regular Linux installation
I wouldn't get so much hung up on latte-dock anyway since it is unmaintained since quite some time and doesn't even work on the latest KDE Plasma 6 (which SteamOS doesn't have yet but will come in the near future)
customizing the default Plasma Panel (right click on desktop > enter edit mode > add panel) is your best bet nowadays for a similar look
anyway if you are really dead set on latte dock you will need to "initialize" all public keys first from the Arch Linux and Steam developers until you actually can install anything on the package manager pacman
you probably have old hardware in that case
the latest kernel releases greatly helped with the effiency of newer AMD and Intel (Hybrid) CPUs which can give you a longer battery usage on laptops
People who deeply care about this typically use a distro which has a strong stance on FLOSS software like Debian or Fedora
Arch Linux is more free on this as long as the user gets a more conveniant way to install everything (even proprietary software)
the Arch Linux way however is also reading every PKGBUILD (where the license is stated) before installing and if you need to have an easier way to search through licenses just programatically solve this yourself i.e. by using https://github.com/archlinux/aur and going through all branches with a script
this task is easy on gentoo but hard anywhere else
in the past I checked package updates via nvchecker, grabed the latest PKGBUILD via ABS, applied the patch, compiled the package and sent it to my custom repository
if you add the repository higher in your pacman.conf it will grab it from that first
but this a huge pita, even going through the route of maintaining an AUR package is simpler
hope this helps with the dumbster fire of the virtualbox version in the official Ubuntu repositories
(virtual box basically "breaks" on Ubuntu LTS once a newer HWE kernel gets released unless you install a newer version of it, leading to hundreds of support threads every time this happens)
If your AMD card is older than your latest linux distro release it's plug and play, no driver installation required
Wayland works pretty well on most desktop environments too
beware fresh released AMD cards in combination with long term release distros like Debian stable, you most likely will need the driver from the AMD website (not recommended)