Which OS Would Be The Best Amiga Way Forward...

[WolfToTheMoon]

For classics and NATAMI, AROS68K... no brainer there...

for the NG-AMIGA, Syllable or Linux/BSD, as a base. I would have included QNX too, but they're now RIM's property.

[WolfToTheMoon]

I do agree that MOS is currently the best Amiga-like OS...

It looks the best, it's the most stable one, the only that *could* support things like SMP and memory protection out of the box. However, hardware future is uncertain, it's closed development and QBox development has been abandoned/delayed. That's why I chose AROS even if MOS is much more advanced.
If MOS would be able to run on ARM or x86 devices then it would be a different matter alltogether.