I picked up a screen with around the same specs today. 34 inch, 21:9, and HDR400 though. Had to think for bit, whether I want to go wide. Like i.e. for city builder and similar tycoon games, 16:9 would perhaps look a tad cooler (due to more height) - and the one on offer has 8 bit+FRC apparently. And a lot of multimedia content seems to be tailored for 16:9, such as many videos on YT, where Full-screen gives two blank areas on the left and right sides.
But 21:9 gives more pixels (which the GPU here should be able to handle) - and I also play other games, such as likely the upcoming Kingdom Come Deliverance II (part one, complete edition, quite cheap on Steam right now, btw), and free bird camera in city builders offers panoramic view - and more space on Win desktop, to put stuff side by side. Also, due to having the same height as my somewhat older 27'' also curved monitor, it looks neat, having both next to each other, forming a curved mild corner.
In any case, visually, it is better than my older screen (already in SDR). And screens with better specs (like HDR1000), they are sort of next class, also price-wise. So, nice to see that there are sort of budget options for "1440p, big size, high refresh rate"-screens around.