Fedora on POWER9 for my daily driver, personally (a dual-8 Raptor Talos II). I like the architecture, having been an AIX admin since the 3.2.5 days (still have a personal POWER6 with it) and a long time Power Mac bigot, and I like Raptor's commitment to openness. My HTPC is a Blackbird.
It shouldn't be a privilege to own a fully user-auditable computer. Cost continues to be a problem, which is why I hope Microwatt gets into more things. But the cost is primarily from the motherboard, which has no economies of scale (CPU prices are actually fairly competitive), and other than the processor everything else is off-the-shelf. Fedora, Void and FreeBSD work well in my personal experience, and there are other choices.