the Cabas!
The NF is very popular and much less expensive, but everyone has one!
Also, the tiny narrow straps are reported to be very uncomfortable when carrying a lot of weight in the bag.
The cabas is very versatile, has thicker straps which I have found to be very comfortable. Keep in mind that any item in the DE has a less flexible, firm leather when compared to the vachetta on the mono or the DA.
The Cabas has a very classy look with the side zippers that make it so unique. I carry a Pomme cosmetic bag, Pomme zippy, Pomme agenda, Pomme clouche, and still have plenty of room for sunglasses and misc stuff, with the sides zipped up. (I emphasize the Pomme items because they are a bit stiff and tend to bit a bit more bulky than other SLGs.)
I have the Cabas, so I am biased. But I have never seen anyone else carrying my bag. I like that!!! While the NFs are much more frequently seen.
Both are great, obviously, and I'm sure you will make the right choice for you!