I have tried both and IMO I prefer 16:10. The extra height is better for me than wideness and games look bigger because of it. Games look a bit cramped in 16:9 from what I've seen, plus:
As you can see in the 3rd pic the left monitor looks taller with 1200p and the right monitor looks cramped and heck part of the flower is cropped with 1080p when it comes to missing parts of the wallpaper.
So I prefer 16:10, what about you?