There are two advantages as far I know, here they are:
First: Snap packages can bring their own dependencies with them. So no dependency hell.
Second: Snap packages can be installed for one user only. So more control of who is running that software.
Some quotes (including source links):
Snaps are isolated from one another to guarantee data security, and
can be updated or rolled back automatically, making them perfect for
connected devices. Multiple vendors have launched snappy IoT devices,
enabling a new class of “smart edge” device with IoT app store. Snappy
devices receive automatic updates for the base OS, together with
updates to the apps installed on the device.
Ubuntu Core is in many ways simply another flavor of Ubuntu (eg, the
root filesystem is built from packages from the same Ubuntu archive as
other flavors), but it differs in many important ways:
- The base system is a very minimal system that consists of three different parts: the kernel, gadget and OS which are all packaged and delivered using the new snap packaging format
- There is a clean separation between the base system and the applications installed on the system as well as a clean separation between installed applications
- Ubuntu Core replaces ‘apt’ with the new ‘snap’ command and applications are packaged and delivered as ‘snaps’
- The root filesystem is read-only
- Developers may update applications independently of the OS
- Applications run in a security sandbox by default
- Ubuntu Core is application-centric instead of distribution archive-centric
The above qualities aim to address many of the challenges inherent in
the traditional Linux distribution model and greatly increase
reliability, predictability and security.
A snap is a fancy zip file containing an application together with its
dependencies, and a description of how it should safely be run on your
system, especially the different ways it should talk to other
Most importantly snaps are designed to be secure, sand-boxed,
containerized applications isolated from the underlying system and
from other applications. Snaps allow the safe installation of apps
from any vendor on mission critical devices and desktops.