best Gaming Monitor 27" for RTX 4080/4090 Oled or IPS 4K?

[Marcus92]

Good evening.

I'm trying to building an new PC with Top configuration, so with RTX 4080/4090.

Actually i'm stopped because i'm totally undecided if i should go with Oled or 4K.
Since for the major part i play multiplayer game, like Fighting Game and FPS, my choice was 27/28 inch monitor, since i heard a lot about that 32inch it's too big.
I play also single player games.

I don't care about the budget, but i just want to make sure to be happy with the choice of the monitor.