When comparing Orage vs Calendar, the Slant community recommends Calendar for most people. In the question“What are the best calendar apps for UNIX-like systems?” Calendar is ranked 1st while Orage is ranked 7th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Integrates nicely into the taskbar
Pro Set visual as well as audio alarms
Pro Online integration is possible by setting up a foreign calendar with a caldav sync
Pro Import calendar data via ICS export file
Pro GNOME native integration
Pro Currently in active development
GNOME Calendar is improved with every release cycle of GNOME.
Pro Simplicity
Calendar for GNOME aims to find the perfect balance between features and usability.
Pro Synchronisation
It has online accounts integration.
Cons
Con Complicated setup
Some features are hard to set up. For example, setting up Monday as starting day for a week is not intuitive.
Con No online integration whatsoever
Con Cannot print
Con Extremely buggy
Con Poor interoperability with online calendars
Does not connect to Fastmail.
Con Far too simple
Con FAR too tied into the GNOME infrastructure
The UI and configuration presume you are running GNOME, and has the ugliness of a GNOME application. Configuration, as is usual for any GNOME application, is pretty much nonesistent.
Con Can't read 'all-day' events with dark theme
Text is white on light blue with dark themes. The workaround: assign all-day events to just one hour.
Con Can't import ics files
Con Continues to pop-up reminders that are turned off and they cannot ever be removed
The GNOME Calendar displays pop-ups from an old Google Calendar that was used. That Google Calendar has long since been removed from GNOME, and even with the notifications turned off on the GNOME Calendar, the pop-ups still happen.
Con Incorrect appointment times when importing .ics calendars
Con No support yet for WebCal
No support yet for WebCal, such as those offered by Facebook events.
A workaround exists. Since this application uses the same background services as Evolution, installing it and adding the WebCal calendars there, also adds them to GNOME Calendar.