Sticking with OmniFocus.
Things is a beautiful task manager, but will not scale to the depth that I needed to while running my business.
I also missed the following in OmniFocus:
Sequential tasks
End-to-end encryption
Omni automation.
I gave it a very earnest try for the past few weeks to make sure that I was still using the best for me, but there's a reason that I've stuck with OmniFocus all of these years.
Kudos to The Omni Group!