The first link is to DVD+R media certified for 16x writing.
The second link is to DVD+R media certified for 8x writing (will do 12x with unofficial firmware).
Both are very good media both in general and specifically for the NEC 3500, and since the price is the same I would personally go for the faster media of the two.
EDIT: Oops, the first link was actually to DVD[color=dimgray]+R media and not DVD-R media, but the link was showing a picture of DVD-R packaging so I was fooled there for a bit.[/color]