Why are you even considering Manjaro?
Because it's an excellent distribution which is also in the top of the Steam Survey (alongside Arch, Ubuntu, Mint and PopOS) (and Flatpak, and Steam Deck's SteamOS).
It's a rolling distro but mitigates the risks of bleeding edge with a curated stable branch, offers LTS kernels going back to 4.19 but you can choose LTS or newer versions or RT patches, it does not force you to switch kernel version if you don't want to, has visual management tools for packages, kernel management and driver installation, does a great job installing drivers during install, comes with extra safety features (update rollback built-in if you use BTRFS for root), Steam works great, you can use AUR and Flatpak etc.