I think the question is not Qubes related at all, as Qubes can’t save you from bad/corrupted/compromised hardware…
An unfortunately there is no real (usable) open-sourced hardware out there - and probably newer will. So we have to make a compromise when selecting a harwdare. Moreover turst is not something measurable, and it is very much subjective.
So for me it is about tho choose the best available option in the time I buy a new hardware. But this always will be limited to you budget, and the market in your area.
I’m personally not trusting any of the vendors, but accepting the risk involved using their product.