For historical interest A/UX is okay, but it is poor in terms of hardware support, thread support, shared library support etc. It is most definitely not a modern UNIX.
Personally I like NetBSD on m68k.

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Agreed. I love A/UX (probably one of the few ppl on the planet working on writing/porting code for it) but I completely recognize that it's just a hobby for my amusement, not a serious endeavor. But OTOH, isn't doing anything with a 68k Mac a hobbiest activity these days? So, use A/UX if you want, but be aware that in many ways it will be deficient to NetBSD.