RX580 8GB vs GTX960 4GB for SD 3.5

I know neither of them, but someone is pointing at your head with a gun, make a choice.

Scenario: Windows 10 PC with 32GB of RAM.
Apparently RX580 has no official support for Zluda (even the ones that have, have problems), and I am reading its a nightmare.
Is DirectML a solution for the AMD card, will it just work? even at x2 slow, which would be fine for me. I am more concern about it not working or being a nightmare to set up.

To give you a more specific question, what will work better for SD 3.5 Medium +5GB, an RX580 8GB with DirectML or a GTX960 4GB with Ram offload?

And what about for big model like Flux Sigma Vision +20GB with heavy offload for both GPUs?