I used Silverblue and tried HoloISO, but it’s the same thing.

Try blendOS. It’s basically Arch but immutable. And SteamOS also exists.

I’m comparing Orion on Linux and Gnome web here.

Chrome + FF extensions (support for both MV2 and MV3 extensions on the Chrome side), PWAs, not being Apple.

Edit: I switched to Fedora on my Mac after an upgrate to Sequoia screwed up.

I used Orion previously on MacOS, and it is pretty good there. At least we will have a better alternative to Gnome web.