When comparing The Unarchiver vs RCDefaultApp, the Slant community recommends The Unarchiver for most people. In the question“What are the best Mac OSX apps for someone that's new to Apple?” The Unarchiver is ranked 1st while RCDefaultApp is ranked 24th. The most important reason people chose The Unarchiver is:
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.
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 Provides missing functionality
Standard features on Windows, but not on Mac, this fixes that.
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 Last update was in 2009
But the software still works, so far no issues on El Capitan 10.11.3.