I’m currently on Fedora, but likely will be switching to OpenSuse. I’ve been looking at to stop distro hopping and make a home for myself finally. (I’ve only been using Linux on and off for the past 13 years.)

Those both default to Wayland for boot them up to live CD and test away

I expect Wayland cinnamon will be good enough to use by next years Ubuntu LTS. And the default in the next LTS after that.

Maybe.

Not to my knowledge

I use fish, mostly because it is the default on CachyOS