I like how easy it is to make recurring events and how it can decode plain English into a title, date, time, and location.

I use the toolbar with a hot key probably about 100 times a day. I use it to pull up my calendar, check meetings, book meetings, etc. I also like the new links to Zoom/Google Meet so it can kick off meetings straight from the app.

Fantastical excels at parsing (enter events in plain sentences and it figures it out (e.g., "lunch with Peter tomorrow from noon to 1pm"), handling of attachments, cross platform macOS-iOS, handling of multiple calendars, view options (I like the 14-day week view).