I have the Viewsonic 2245WM panel and I cannot say if it is the best as I have not compared it to the others.
I like having a Powered USB Hub and the card reader built into the base of this monitor, I find both these very useful for the way I work with my system. As far as the display itself - I find it very good with sharp, bright images and text, and HD movies look very good too. I cannot find anything negative to say about this monitor. I am sure there are others better then this, but as long as I have not done side by side comparisons I cannot judge this monitor to be the "BEST" out there.