Most of the reviews your hearing about the 3d monitors having a better picture is coming from the fact that when it refreshes at twice the speed of a normal monitor dragging windows around and so fourth is smoother. In a gaming situation your not worried about that, and your not going to see it, your to busy looking to kill the next guy or not get killed, to kick back and enjoy how that bush moves a little more smoother then it did.
A 2560x1440 resolution is going to give your a better picture then then 1900x1080 at its native resolution because you have a higher pixel count, and alot of people who own these higher res monitors dont usually have to run AA just because the resolution difference. I noticed this back in the day when most were running 1024x768. As a example of the difference you may see, I had just built a new comp and my monitor would support 1600x1200. When playing battlefield vietnam i would get kicked out of server for sniping with the m-16 while the other guy couldnt even see me because back then the view distance was tied to your resolution.