They are great for gaming because most games support 21:9 and this gives you a huge FOV with less screen movement while playing. Outside of this they just look cool. This is why I like them.
Here's a thought experiment. Let's say you had the same monitor as you do now, except it was taller, adding pixels above and below to make it 16:9. If you wanted to, you could still game on this monitor at 21:9 resolutions with letterboxing, but also giving you a choice to game at 16:9 and giving you more vertical space for web browsing. It would be the same monitor as yours, only taller with more pixels. Would you swap for it?
I would have to try them each. I'm probably less picky about monitors than most people because 1080p still looks great to me and 75Hz is perfect in my mind. What is important to me is good color accuracy.
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