You have some interesting information. Apalutamide, enzalutamide and Darolutamide have all been approved, though not for the same thing. It seems all can actually be used in almost all cases.

Apalutamide is approved for nMCRpc mCSPC
Enzalutamide has been approved for nmCSPC mCRPC
Darolutamide has been approved for nmCRPC, mCRPC and mCSPC

I suspect some of these have been approved for more than I have listed.

I am mCRPC and have been on Darolutamide for over a year, all paid for by Medicare. It works great, better for me than Zytiga.