When comparing Business Calendar vs Annual View, the Slant community recommends Business Calendar for most people. In the question“What are the best calendar apps for Android?” Business Calendar is ranked 6th while Annual View is ranked 15th. The most important reason people chose Business Calendar is:
Business Calendar offers configurable widgets in many sizes for displaying Days, Weeks, Months or Agenda views on a user's home screen.
Specs
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Pros
Pro Widget support
Business Calendar offers configurable widgets in many sizes for displaying Days, Weeks, Months or Agenda views on a user's home screen.
Pro Free ad supported version available
Business Calendar comes in a free ad supported version.
Pro Smooth zoomable user interface
Business Calendar has a user interface that supports scrolling and pinch zooming.
Pro Search function
Business Calendar has a search function that allows searching the calendar for dates and events.
Pro Integrates with Google Maps
Users who input locations can use Google Maps from an event to find the directions and location.

Pro Move Calendar events from one Calendar to another
The only app that has the ability to move an event to a different calendar if it was accidentally created in the wrong calendar. This app is an essential addition to any device and for anyone with multiple calendar accounts.
Pro Events can be created using the share menu
Pro Can manipulate with multiple events at a time
The app allows selecting multiple events and move or delete them together.

Pro Semester view for displaying 6 months on the same screen

Pro Aligned day number view
This new view aligns months according to days numbers.
Pro Ad-supported, full free version available
A full free version is available now.
Pro Zoom
Users can zoom in on the calendar to get a less noisy view of events.

Pro A comprehensive overview of all events in a given year
The calendar app lays out all events of a given year in a single view with months on x axis and days on y axis. The events can be identified by their color codes and assigned letters.
Cons
Con Poor visual design
The design of the app looks a bit dated, something out of the early 2000's. While this does not impede the usefulness of the application, it still is a sore point when compared to some of the other popular calendar apps available on Android.
Con Widgets don't show week numbers correctly on some devices
Widgets on certain devices have been showing week number incorrectly for more than 2 years. The issue hasn't been addressed and there is no sign that it will be.
Examples from S4:
Con Poor support
The developers provide virtually no help with issues.
Con Noisy UI
With such information density and small scale of each interface element, it can be hard to get a sense of what information is presented.
