I have never used a N/S weber so I don't really know. But, I was thinking that using it as a smoker would be better in a N/S design. One problem I see with the N/S designs is that they use more flavo bars and more burners which I would think could get expensive when it comes time for replacing them not to mention it seems like it would be harder to keep everything cleaned up.
I think most of these weber grills have a BTU rating on them and generally around 36,000 on the older genesis silver B's. What is the rating on the newer N/S grill? It should be on the data sticker.
As far as reselling one of them, provided they both clean up well, you will probably get a better price for the newer one. I am not saying it is better, just my opinion of what potential buyers might be looking for. You know, those buyers that know nothing about grills and will probably never clean it and just wind up putting it out on the curb in three or four years because they think it is worthless.
BTW, your photos are not showing up.