I really like the look of the Cabas Rivington bc to me, it looks like a unique twist on the NF. But while you say, assuming both bags have the same price tag, are you and your friend aware that the Cabas Rivington is about twice the price of the NF? At that big of a price difference and a similar look, I would go with NF or a bag that looks altogether different for the Cabas price.
Side by side of a neverfull mm and cabas rivington. I put small boxes inside to maintain the shape
NF! I was also considering the Cabas Rivington but after watching a comparison video on youtube I decided it wasn't for me. I feel like my lifestyle is to casual to pull of the brass zippers on the sides (ie: it may look a little to fancy hanging off the treadmill at the gym). Also I have narrow shoulders and have trouble keeping shoulder straps in place. In the video one of the Cabas straps was falling of the shoulder and when the sides are cinched they are much more intrusive in the Cabas than in the NF making it more difficult to access items. The comparison also mentioned that the Cabas was stiffer and after being zipped several days had trouble maintaining its open shape.