Calendars 5  vs WeekCal

Calendars 5 uses the reminders that already exist, and can add new reminders with Siri.

Unique and efficient way to display weeklong agenda in portrait view.

Calendars 5 makes it very easy for users to create an event by just typing it in human language.
Simply write something like 'Meet Ben tomorrow at 5PM at Starbucks' and Calendars 5 will parse everything, creating an event for tomorrow, inviting Ben from the address book and picking the Starbucks on the map.

The choice of font size, color and user interface widgets are all esthetically pleasing.

The new notification center puts all the info in one place, and lets users choose from several different views.

The UI provides a very simple approach to repeating events or reminders. Users can choose from daily, weekly, monthly, or yearly, number of weeks, or by specific days.

Moving the date of an appointment is easy.

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.

Week Calendar supports dropbox file attachments in collaborative calendars so other people are able to quickly see files relating to an event.

With the action menu, users can use up to 40 kinds of automated actions.

Just like with apps on the home screen, events on Week Cal can be moved with a tap and hold gesture.

Week Calendar displays a day's events just by tapping the date. The data can be tapped directly from year view.

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.