I ran 5 calendars simultaneously recently to choose a preferred option.

I went with Google calendar with Outlook a close second (also tried sunrise, cal and Business calendar). I quite liked Outlook and would have gone with it as my joint mail/calendar but found it would slow down and crash with larger mail accounts.

Whatever you like its quite a good option to install several and use them side-by-side to get a feel what you like. I did the same with mail clients too and ended up with Nine, again Outlook being a close second.

Good question. I'm going to continue to use sunrise until bit rot renders the app unusable. Really going to miss the "find a time that works for both of us" keyboard.

That is probably the best third-party keyboard.

I am giving Fantastical 2 another try.

https://flexibits.com/fantastical

I am back to the standard iOS Calendar. Don't really love it. I hear Outlook is actually pretty good.

That's extremely disappointing. I just started trying it out sync'd with my Google calendar.

Maybe I'll try Outlook, if they implement the Trello 2-way integration.