These two are bags of very different styles. The Rockstud (Spike) crossbody is a carried over model from the previous designer, Pierpaolo Piccioli, and the top handle is from the current designer Alessandro Michele
The volume of these two bags are very different, with one being a camera bag (more casual) with limited capacity. The top handle (more formal) will be the one which can carry more
There’s no absolute conclusion on which bag is going to be better than the other, I think it depends on which style you are going for, what your lifestyle is, what do you want the bag for, and what bags do you have in your current collection
Fact wise, the Rockstud line, even though it’s not in vogue now, it’s still a money spinner for the label, whereas in the current markdown, the chain flap bag version of the top handle (with the same quilt pattern, the Quiltie 67) is already going for a 40% discount
As for longevity in terms of how long both designs will stay current for, no one can make a promise on this as Valentino is not known to have a “classic/permanent” line like the Chanel Classic Flap or the LV Speedy, but the designs of the two bags in your consideration are considered “classic” enough for you to enjoy for years to come, as with a majority of other Valentino bags
When it comes to the material, I can’t really tell what is the leather being used on the crossbody but I would say take a look on resale sites and see how the used bags look and you can decide if you like them (as far as I know, only 2 types of leather, aged calfskin, and soft nappa, are being used for the Rockstud Spike line). As for the top handle, I am not too familiar with the new designs. Durability wise, some models of Valentino bags, such as the Alcove line, or bags with rigid structure (the Loco, Supervee) can look as good as brand new after a few years if you take care of it well, whereas some leather that Valentino uses, such as the smooth calfskin used on the original Rockstud satchel, can aged pretty badly, especially when the bag is soft and squishy
Hope all these info help and welcome to the Valentino family!!