Freddie, with all due respect, the battle between nVidia's and AMD's GPUs is a constant back and forth. One cycle nVidia has the lead, like when the 200 series came out. The next cycle AMD has the lead, like when the 5000 series came out.
FWIW the benchmarks you see for GPUs are completely irrelevant for DAWs. Those benchmarks show the GPUs ability to do things in video games. A cards ability to compute 3d shaders and tessellation has nothing to do with DAWs.
Apple has gone back and forth over the years between AMD and nVidia cards. The one thing that remains constant for them is that they
always ship their products with outdated video cards and very rarely, if ever, offer the top of the line models. But then again, who uses their computers for gaming?
In my experience I've found the AMD and nVidia control panels to have the same feature set and abilities. I actually prefer AMD's Catalyst Control Center, but that's just personal preference. All the settings that are in the CCC are in nVidia's control panel, and vice versa.
In the end, for a DAW, finding a fanless solution with multiple digital outputs is far more important than what brand it is. Just make sure its a recent card with enough memory and you'll be fine.