Hi,
I've got both these monitors and I play (competitively) an old FPS game which I run at 360+ FPS in most cases. Like you, I was also wondering about which I should better buy between the XL2546K and the PG259QN.
I first went for the XL2546K because of the better UFO images that could be obtained with DyAc+. The monitor felt more responsive and faster compared to my previous 1440p 240Hz monitor from Lenovo. But then I realized that it was also the case with DyAc+ OFF.
I thus got the intuition that stroboscopics was in my eyes the dominating variable for motion quality. For me, DyAc+ or blur reduction, it is not as important as stroboscopics.
Reason why I purchased the PG259QN. I unboxed my PG259QN on Saturday and I won't switch back to the XL2546K. My game experience was evidently enhanced with this monitor. And for me, it is clearly thanks to the refresh rate. The improvement from 240 to 360 Hz is 'substantial' although I can't really call it 'massive'. It is about as much improvement as I would have expected. I'm really happy with my game experience with this monitor, I really enjoy swapping my crosshair between opponents during those killing streaks. Altough improved, the experience is still far from perfect, and I know I would definitely benefit from having an even higher refresh rate monitor, up to at least 1000 Hz.
Also, the PG259QN is IPS whereas the XL2546K is TN.
By the way, the XL2546S and the XL2546K have the same panel I believe:
ZOWIE_Support: << Our XL series material and production are seriously impacted during COVID period, the supply issue is getting improved but we will focus on XL2546K production rather than XL2546S, since they are using the same panel. >> from
https://www.reddit.com/r/Zowie/comments ... s_xl2546s/