There's no right or wrong answer - it really depends on your preferences, and how you will use your new countertop / work top
The appearance as Granite is quite unique and I think difficult to replicate in any other material. The downside is that Granite must be sealed regularly, and damage can be expensive to repair.
In my opinion, you can't beat Corian? when it comes to durability and ease of maintenance. DuPont produce "Corian?" with some 72 different colors and over a dozen different edge styles. Your finished Corian countertop has no visible seams. It is non-porous and is guaranteed not to stain.
In the USA have a look at
http://www.corian.com/CorianPublic/c...index701a.html
in Europe have a look at
http://www.corian.com/CorianPublic/c...index701b.html