Best 120HZ monitor For Gaming

Hi, I was looking for a new monitor and i was about to buy a Dell U2312HM, but then i realized that 120hz monitors are better for gaming.

So i was looking at these two monitors, ASUS VG278H and the ASUS VG236H But I wasn't sure what was the difference between them; Is it just the bigger screen and the Vision 2 glasses?, what about image quality/response time/ghosting?

I was leaning more towards the 23" one because it's cheaper, but i don't know if the image quality is the same. I've read awesome reviews about the 27" one, but i can't seem to find any comparisons between both.

I was also thinking on buying the 23" but the one that comes without the Vision 1 glasses and buying a Nvidia Vision 2 glasses since they are more advanced.

So what do you recommend?
Do you know if there are other 120hz monitors that are better than these two?