Choosing between a D16 workstation and Talos II lite

Greetings people:

I've manage to save enough money to buy one of those two machines (D16 or Talos II lite) but I don't really know what to buy:

- On one side, I know that not all distros Run on Power9... the architecture is ppc64 if I recall correctly and Trisquel does not provide support for that architecture yet... I think my only option would be using Debian or a modified ubuntu with a linux-libre kernel. Am I right?

- I suppose that pre-build binaries and third-party repos are out of the spectrum If I choose Talos II (correct me if I'm wrong).

- On the other side, Talos II needs support and it is positive move away from Intel and AMD.

Please, any opinion, peace of information, etc, that helps me decide is very welcome.

Thank you very much :-)