At first when you play on a wide screen or curved screen you notice a sense of immersion.... but when you go back to a quality 1440p screen, the better screen quality that is available **if you choose one" just slaps ya in the face with the improved color range, brightness and lack of motion blur.
The best gaming experience for single screen at ... any cost ... right now is 1440p, 165 hz, IPS w/ < 3 ms combined lag and response time. They are running up to $100 over last year's cost $730 - $790 at the moment because supply isn't keeping up with demand.
Acer XB271HU and Asus PG279Q
As for the wide ones, make sure you keep your PPI (pixles per inch) up near 100 (> or close to 96) less than that will make the image look "grainy" in you have normal vision as you can see individual pixels. http://thirdculture.com/joel/shumi/computer/hardware/ppicalc.html