When comparing Calendar 366 II vs WeekCal, the Slant community recommends Calendar 366 II for most people. In the question“What are the best calendar apps for Mac OS X?” Calendar 366 II is ranked 9th while WeekCal is ranked 10th.
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Pros
Pro Multiple views & themes
Pro It sits in your menu bar and you can activate with a hotkey
Pro It syncs well across platforms
Pro Templates
Week Calendar includes templates, which are files containing one or more events that can be duplicated from week to week. With each event, information such as address, time, or duration can be copied as well. This comes in handy for routine events like work, school, or exercise.
Pro Dropbox attachments
Week Calendar supports dropbox file attachments in collaborative calendars so other people are able to quickly see files relating to an event.
Pro Action menu
With the action menu, users can use up to 40 kinds of automated actions.
Pro Easy to move events
Just like with apps on the home screen, events on Week Cal can be moved with a tap and hold gesture.
Pro Quickly see relevant info
Week Calendar displays a day's events just by tapping the date. The data can be tapped directly from year view.
Pro Custom color
Best thing is being able to set different colors, if you have multiple events during the day it really helps to set different colors to easily get an overview for school lessons as an example.
Pro TextExpander support
Pro Dense week view
Cons
Con Too expensive
Does not replace a full Calendar app.
Con Can't see a full calendar
You are only able to see and use a snapshot instead of being able to see and use a full scale calendar.
Con New PRO subscription
Pro subscription needed to get same functionality that existed for previously paid customers.
Con Issues with repeating events
When making templates, multiple repeating events can't be duplicated from within the same file.