When comparing Growl vs RCDefaultApp, the Slant community recommends Growl for most people. In the question“What are the best power user tools for macOS?” Growl is ranked 15th while RCDefaultApp is ranked 69th. The most important reason people chose Growl is:
In addition to all the applications that other people have written that support Growl, Growl includes several 'Extras' that serve various functions.
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Pros
Pro Support for a lot more applications than the default notification system
In addition to all the applications that other people have written that support Growl, Growl includes several 'Extras' that serve various functions.
Pro Ability to be themed
Growl comes with almost 20 themes pre-installed so you can pick what works best for you. You can also create and install your own custom themes.
Pro Sync with mobile phone via Prowl
Prowl is the Growl client for iOS. Push to your iOS device notifications from your Mac or Windows computer, or from a multitude of apps and services.
Pro Provides missing functionality
Standard features on Windows, but not on Mac, this fixes that.
Cons
Con Last update was in 2009
But the software still works, so far no issues on El Capitan 10.11.3.