I see some appeal (cross-platform, stronger sync privacy claim) but how do the task management features compare?

Why?

Help us to learn from your experience.

Perhaps my use case is pretty simple, I only need the following:

- projects - recurring tasks - deferral dates - deadlines - ability to set the next occurrence either with a fixed period (every X days) or with a floating period (X days after the last completion)

Everdo provides all of those features in a, subjectively, simpler user interface. I think the killer feature of OmniFocus is custom perspectives. I don't use them so it wasn't hard to migrate. YMMV.

Also, even after years of use, I find OmniFocus' desktop UI a bit confusing and convoluted. It got a lot better, but still not great. They focused on iOS at some point, but I don't use GTD managers on the go.

By the way, Everdo is basically a clone of NirvanaHQ[1], a pretty popular GTD tool.

1. https://www.nirvanahq.com/