Because nobody has stepped forward, I will answer.
First. I am not a poor man. I am a person with sometimes severely limited resources.
NAS aka NAFTA 2006 vs 2007.
I have some experience with my 2004 so a 2006 T1N replacement made sense for me.
The T1N is somewhat more basic as to systems/parts.
Off the top of my head, in general terms.
T1N
The T1N is just generally easier to work on DIY.
The 5 cylinder engine has good history for longevity.
The pollution controls are more basic vs 2007 (NCV3). Eg. - No DPF.
Engine oil choices are less expensive and restrictive.
The T1N modules are a bit easier to access with relatively inexpensive scan tools.
The vehicle systems are a bit more basic. Eg. - T1N door lights are controlled with ground switching vs a module in the NCV3. Dash warning lights are LED's vs displays for NCV3.
The engine replaceable components are generally easier to access.
The drive train uses more traditional components such as replaceable front wheel bearings/seals.
NCV3
The van is reported to be more modern and generally updated.
Transmission RSN has not been a problem.
The NAS aka NAFTA 2007 and 2008 MY are reported to be the most DIY friendly of the NCV3 models.
I'm missing a bunch of stuff above.
My opinion.
A good T1N can be great for DIY, but they are only getting older.
If an NCV3 is desired, a good NAS aka NAFTA 2007 or 2008 are the best model years for someone planning on DIY maintenance.
This reply should help to get others to throw in more opinions.
vic