Cancer Care Alliance in Seattle is among the best in the world. OHSU has a great reputation as well.
The drugs you are being offered (Zytiga or docetaxel) are offered to men who have been newly diagnosed with metastases. So either your doctors believe you actually have distant metastases, or they just said that to get insurance coverage. There is a fairly simple way to tell - compare the spots that showed up on your original bone scan/CT to the ones that are there now. If they have shrunk as a result of the hormone therapy you've been on, then they
are metastases. If so, then there is no known cure, but it can be treated as a managed disease.
If they were
not distant metastases, then chemo may slightly increase your odds of a cure. In one study, the 3-year survival went up from 89% to 93% when docetaxel was given after radiation. This is described here:
/pcnrv.blogspot.com/2016/08/docetaxel-with-primary-radiation.htmlI would guess that Zytiga might have a similar effect, but there haven't been any studies published so far to confirm that.