When comparing Snapd vs XBPS (X Binary Package System), the Slant community recommends XBPS (X Binary Package System) for most people. In the question“What are the best Linux package managers?” XBPS (X Binary Package System) is ranked 4th while Snapd is ranked 23rd.
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Pros
Pro works on multiple distros
Pro Extremely fast
Pro Can detect incompatibilities
XBPS can detect incompatible shared libraries or dependencies and gives you options before installing.
Pro Can install binaries or build from source
When installing software you can choose to install binaries or build it from source (natively or cross-compiled).
Pro Lots of features
XBPS can not only be used for installing/removing packages, but it can query for package info (such as version, dependencies, size etc), reconfigure packages, report and fix issues by modifying the package database, search for alternatives, manage local repositories and various other useful tools.
Pro Allows partial updates
Pro Written from scratch
Cons
Con Slow and resource heavy
Due to its self-contained nature, snaps take a long time to open and consume more resources than other packages
Con Proprietary backend
The server backend is proprietary.
Con Not just one command to run
It's not a very big drawback, just not as convenient as one command with multiple options to remove and search for apps.
Con Unable to create packages under a non-xbps distribution
Makes maintaining packages a hassle.