Do you want the bakkie as an everyday car that put surfboards in on the weekend, or a workhorse that you load up everyday?
If it's for weekend recreation, get the Chev. It has a much better set of features, and will be nicer to drive.
The NP200 is a tool. It has a bigger load box which is also rubberised. The NP200 can carry 800kg, and I have carry loads close to that before. The short 1st and 2nd gears are great. The bakkie is slow, but I drive the 8v version not the 16v one.
If you want diesel, you'll need the NP200, as I don't think that GM has any 1.3 UTEs left.