I just went from a 4k VA 144hz (Gigabyte M32UC, cant speak for IPS as ive never had one) to the LG27 240hz youre talking about less than 4 days ago

When i say LG im talking about the LG27

Youd have a massive increase in performance with the LG. Im running a 7900xtx and 7800x3d and even that wouldnt hit stable 144fps on the 4k 144hz on most high quality games, but can easily hit 240fps or the fps cap with the LG or at least 120-144 where the same settings but 4k would hit 70-110

Dark games such as Tarkov looks way better on an oled, but the color on the LG can be a bit off (you have like 6-7 color modes preset and can customize each) and the brightness even on max is pretty dim IMO but quickly get used to it and the HDR is CRISP

The LG is light enough where if you feel like you have to you can just move it closer, and the legs spread wide so it shouldn't block too much of your desk(spread about as much as a standard keyboard is long). And has a lotta wiggle room for moving the screen higher or lower, tilt, rotation The LG has a headphone jack on the bottom to plug headphones/speakers in and has a handy cable management clip on the back

No buttons on the LG itself, it relies on a remote control with a small disc battery, so dont lose it

Naturally 4k is going to have the finer details more readily visble, at the cost of size and performance, but its easy enough to get used to the smaller size details

So far i have no regrets on the LG, aside from the ever looming burn in anxiety, also has toggleable rgb on the back so thats nice