I use Fantiscal for both the Mac and iPhone. However, the lack of time travel meant that I had to go into the default calendar app to set it. Then, I discovered that even though I can’t duplicate appointments in the default calendar app, when I started typing an appointment, I could select it from history which pretty much did the same thing.
I use fantastical for the Mac because of the convinient pull down calendar, but use the default app on the iPhone, so I can set travel time.
It’s amazing how a single feature or bug can make or break an app. For Path Finder it was the inability to update the desktop and browser windows.