I would go for the Chimei, partially because a BenQ will cost you a lot more, and partially because I know that they are fantastic monitors.

It has an excellent contrast ratio (800:1 as opposed to 700:1 of the BenQ); better brightness (330ccm^2 vs. 300ccm^2) and slightly larger viewing area.

The colours are a few less (16.2million vs. 16.7million), but the section of the spectrum that the Chimei is incapable of won't lead to any noticeable discolouration.

That's my (biased) opinion.