Originally Posted by MenacingTuba
They both have negligible input lag, but the BenQ has considerably worse colours,obvious ghosting and a grainy matte screen compared to the VG236H.
If you want a matte 120hz display and don't want to downgrade get the Asus VG278H or VG278HE
You seem very biased toward the XL2420T. There's only ghosting if your hardware can't support the 120Hz. With 120Hz enabled, you will notice less ghosting with higher frame rates. This is the inherent nature of the technology. As for the grain, almost all LCD screens have this anti-glare coating. And in most circumstances it's only noticeable if you focus on it. Also, ASUS has absolutely appalling customer support.
Read this review of the XL2420T on TFT Central for a detailed idea of how this monitor performs: http://www.tftcentral.co.uk/reviews/benq_xl2420t.htm