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Zypper uses a SAT solver for dependency solving issues and this helps with increasing Zypper's speed considerably.
Pro Clean and logical
Pro Great dependency solver
Zypper's dependency solver is built on top of SAT solver which is one of the best package dependency solvers available for Linux.
Con Not the default package manager for many systems
Zypper is still relatively new. As such, it's not available as the default package manager in many systems.