Mario Sangiorgio (npub10vl…c65p) I had to rush out so I haven't switched, yet. First rsync has finished in some minutes, but I'll switch in the evening. I'll keep you updated.
I think that NetBSD can be a good choice as FreeBSD will lose support for armv6. As for Linux, I tried with Alpine (which I've used in the past with that PI) but didn't boot. Maybe I'll have a look at Alpine and try it as well.