I think it all comes down to what you think of both trucks. You're obviously going to get a biased opinion here.
Back around 2000 I looked at the Nissan trucks and I wasn't at all impressed. They just felt cheap to me. The plastic felt and looked like it something that was just thrown together in order to get the truck out of the factory on time. The doors felt like something you'd find on an $8000 throw away car, not a $20K+ truck. I never got around to the test drive, as I was instantly turned off by the Nissan after sitting in the cabin. That being said... I do like the little storage compartment that they've got behind the wheel on the driver's side
If it were me, I'd go with the Ram