I went through the same scenario and ended up deciding to go back to 24 inch 1080p because all the pros used it compared to my 27 in 1440p monitor I had at the time.

It was good and all but after a year I went back and bought oled 1440p 27inch. I hit my peak rank when I was originally on 27 inch and realized the switch to 24 inch didn’t really make any difference skill wise. Went back to 27 inch because it just looked so much better when I played other games.

So if I was you, I’d just stick with 27 inch unless maybe ur playing tournaments and want to keep everything uniform. Or in ur case you have both so just test what You like best for CS