Myself I like more AMD/ATI approach for being more honest in propagating their products. Anyway, it's hard to judge these two competitors when no one is having cards on the market. So, let's choose the "best card" in better times.
For my needs I'm looking for new AMD APU, seems like next year could arrive at consumer market. This gives sense for me merely random playing some RPG or strategic game.
If you still like to play some games in flash, be careful as Microsoft is planning to hard remove flash player from your computer with update KB4577586 or with Annual Update 21H1 (most likely, will come in June). You may either grab some 3rd party flash player or disable windows update with StopUpdates10. The second is more of a solution but you will freeze your whole system.