240hz+ 4k vs 500hz+ 1440 for 5090?

Hi all,

I am getting a 5090 + 9850x3d rig delivered to me next friday which I am stoked for. With this, I am looking to upgrade to an oled monitor from my AW2723DF (1440p 280 hz fast IPS).

I will be doing both work tasks and gaming on the monitor. The main games I play are FPS extraction shooters (Marathon, Arc Raiders, Tarkov) and I do that somewhat competitively where I obviously prefer a fast monitor with a high refresh rate.

On the 1440p side, I have been looking at PG27AQWP-W (1440p 540Hz/720p 720Hz) which is currently available in my country. I would probably never use the 720p version here (because 720p).
On the 4k side, I have been eyeing the PG27UCWM (4k 240Hz/FHD 480 Hz) which is launching later this summer. For this one, I feel like the FHD 480Hz mode could come into play when playing more competitive titles where those frames could be pushed.

I have seen a lot of people argue that the 5090 was "made for 4k" and thus maybe I am gimping myself a bit by not getting one. Maybe I am missing some other options here that are either launched already or coming up during 2026. The ideal monitor would probably be a 5k/1440p monitor where 5k would be used for productivity/scinematic titles and the 1440p mode for cometitive titles.

All tips appreciated. Thanks in advance!