Hmmm, i personaly like samsung better. The Viewsonic has the maximum resolution of 1600 x 1200 @ 68Hz wich is not good. the 68Hz gives an uncomfortable image. You should have a frequency of at least 72 Hz. From what i know bout the samsung, it has a max of 1600 x 1200 @ 68Hz too, although the pitch of .20 is better than the Viewsonics .21. But that is a minor difference, i wopuld look at the price to make the difference.
By the way, why not choose for a samtron, the 96p is about the same as above, but has a maximum performance of 1600 x 1200 @ 76Hz, that does matter. Although that one is a lot cheaper!!!