When comparing The Unarchiver vs PowerArchiver, the Slant community recommends PowerArchiver for most people. In the question“What are the best alternatives to WinRAR?” PowerArchiver is ranked 3rd while The Unarchiver is ranked 5th. The most important reason people chose PowerArchiver is:
Over 30 formats are supported.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Excellent Finder integration
The app can be set up to work just as the built-in Archive Utility OSX comes with so that archives are extracted by a simple double-click.
Pro Supports most archives
Over 30 formats are supported.
Pro Fast
Multi-core engine for performance.
Cons
Con Lacks RAR5 support
RAR 5.0 format introduced in 2013 uses a new compression algorithm that is not compatible with previous versions of the format. As such, all software needs to be updated to include support for RAR 5.0 and The Unarchiver has not yet added it.
Con Not free
Not free, but is worth the investment.