at different price points, its debatable. but its generally accepted that AMD controls all of the sub 200$ price points almost. all sub 100$ is essentially amd(6670 ddr3, 7750 ddr5) and the 100-200 is populated with generally:
(7770(alternatively, 6850), 7850 1gb, 7850 2gb) for that price point which they perform as expected for their prices. past that, its debatable depending on absolute settings and game set.