I once downloaded all of your mentioned app and almost any other calendar app on the AppStore to find the perfect one (for me).
At the end I have 3 calendars now; the stock iOS calendar, my favorite calendar app "Week Cal" and also Fantastical.
I just have Fantastical you create events or tasks via Drafts app and the powerful URL schmeming and natural language engine.
Else "Week cal" is the best calendar app, which offer anything you could wish for. It fast, looks good, you have lot of customization options, themes, quick edit, TextExpander support, URL scheme for creating new event, a lot f different view which are customizable, rolling view of month and million other features