Mentioned Ubuntu since its backed by Canocial and fairly popular desktop distro. Mentioned Fedora instead of RHEL because RHEL is mostly used for servers and maybe in schools or high security environments.

You could consider Ubuntu, Red Hat Linux and Oracle Linux to be about as standardized as Windows or Mac. These distributions are usually what larger enterprises use for servers and sometimes for software development, IT operations etc. These are about as standardized things get in the linux world.

Now when it comes to using Linux as daily driver there are so many options out there and none of the distributions have really yet hit the mainstream. For my understanding it’s been long been battle between Ubuntu and Fedora with their derivatives but with SteamOS using Arch Linux would not be surprised if some sort of Arch based distribution with maximum Proton combatibility would gain popularity.

Arch itself seems too minimal to be considered as “standardized” operating system.

According to the big tech its ok if you’re training large language model with it.