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Witcher 3 has Hair Works, which might lower performance of AMD cards because of its proprietary code, IIRC.
A 480 would be no problem for your PSU and does not get too hot with good cooling.
As you stated, AMD excels with DX12 and Vulkan versus Nvidia because AMD uses Asynchronous Computing better and etc.
I have a HD7870 and it still seems to be viable against recent competitors. Even with my old card hair works is not that bad.
Not sure what upcoming games will want but for now this card is still able to play all titles fine.
I play at 1920x1080