Best Oled 2k 27' Monitor for FPS player?

Hi guys, I'm currently running a normal IPS 27'2K240hz monitor and looking for switching towards a 27' 2K Oled Monitor with similar or higher refresh rate. I play mostly FPS games and decent amount of triple A games. I've been looking at the ASUS ROG Swift PG27AQDM, XG27ACDNG, and LG ‎27GS93QE. I wonder if there is some general recommendation for these monitors.

Is there a huge difference between QD-Oled and W-Oled in the current generation? Also does higher refresh rate (>240hz) really matter?

Any advice will be appreciated!!