As of Blender 2.8, Nvidia has been working very closely with Blender Foundation for enhancing the raytracing GPU using Nvidia cards. This is why we now see accelerated support for Optix (RTX) as well as Cuda in the latest releases. The latest RTX drivers and cards can now speed up GPU renders as much as 4 times faster than just using the CUDA versions of the cards with Cycles. Nvidia began funding Blender development fund in a major way back in October, and it's likely that Cycles will be developed around the Nvidia GPU drivers and hardware going forward. Although AMD is still supported and being developed as well. I feel the perfect pairing cost effective solution is AMD cpu with Nvidia GPU at this time, since almost all well developed GPU render engines take heavy advantage of the Nvidia architecture these days. Cuda support is also found in many other types of GPU enhanced workflows such as Adobe products as well, which are also moving toward RTX for raytracing support, so with this in mind I do recommend the Nvidia GPU solution for the time being.

Although I tend to also go with Intel for CPU since Embree support is something I need in other packages, and the Intel Denoiser in blender is amazing. I think that's open source though, and should also work on AMD?

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