The title tells everything....
Evernote in the choice of swipes. And 2 swipes for right and left would be much better.
Outlook is very good but lacks professionalism there. Spark and Airmail offer plenty of choices, very good for triage.
Hope to see this options very soon.
As for Omnifocus, it'd be very good to have a Fantastical Integration.
I know that Outlook provides a calendar, but others do the same (Spark for example)
But the big advantage for Fantastical is That you have in the same app and the calendar and the reminders together. Which would make a big improvement for a professional email client...