With regards to the aspect ratio, flight simming was a factor in my decision to get my 22" IPS. It runs a somewhat lower resolution than most monitors (1680x1050) which makes it easier on the graphics card and it's 16:10.
That wasn't much of an advantage in IL2, but in flight sims with true widescreen mode like CoD it does give a bit of usable extra vertical space that i find useful: easier to check the sky above or keep tabs on the target in a banking turn during a dogfight.
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