When comparing Evolution vs Calendar, the Slant community recommends Evolution for most people. In the question“What are the best calendar apps for Linux?” Evolution is ranked 2nd while Calendar is ranked 3rd.
Ranked in these QuestionsQuestion Ranking
Pro Great integration with Gnome environment
Pro Manages contacts, tasks, calendar and memos as well
Pro Clean interface with 2 layout variants
Going to View > Preview has the option of switching between "Classical View" and "Vertical View".
Pro Supports exchange servers
Evolution is one of the few Linux desktop e-mail clients that's supports exchange servers.
Pro Good support for Google's services
Pro HTML rendering is great
Of the many email clients available on GNU/Linux, Evolution has the best HTML renderer. It renders HTML and the entire email content exactly like it would appear on a full blown web browser. Not many email clients are capable of doing that.
Pro Excellent GPG support
The integration with GPG is excellent. You can sign, encrypt, decrypt, authenticate and verify GPG signatures and GPG signed/encrypted email messages. All of that is just a setting away.
Pro GNOME Native integration
It has online accounts integration.
Pro Currently in active development
GNOME Calendar is improved with every release cycle of GNOME.
Calendar for GNOME aims to find the perfect balance between features and usability.
Con RAM heavy
Very heavy on RAM usage.
Con Only available on Linux
If you have to switch to another platform for whatever reason, you will need to search for a different email client.
Con Tied to Gnome
Pulls in Gnome.
Con Can't choose different settings for each mail account
Settings have to applied to all mail accounts.
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.