If I understand your question, you're wondering what resolution I recommend playing the game at?
I always play the game at the highest available resolution for my screen, which is usually 1080p. I haven't tested the game in 4k, but it should work in theory... Imo the game still looks pretty sharp in 720p or even lower, as long as anti-aliasing is set to 4x or 8x.
So I guess the best resolution is "the highest your computer can do while also keeping antialiasing at at least 4x". But any resolution should work fine (even ones which aren't 16:9).
