Most functional distro, as of now

[bcnaz]

PMOS and Dremur's/Arch are both able to work "Out of the Box" just install and run, but they do both take more "Linux skills" to use and care for.

While Mobian also works "Out of the Box" ---> but, it is possible to use with just basic user skills and easier to add software.

As an "Out of the Box" operating system, UBPorts is 'almost' there.

If you have developer skills there are dozens of operating systems that can be "Made to work"

My opinions are my own, from trying the systems myself. Your opinions will probably differ.