I like Gaia. You can transfer all Google Earth / Garmin waypoints, tracks, trails, areas, etc into Gaia so they're available within the app. I personally use a combination of GE / Basecamp to manage everything, and then load in what I need.
I've heard it's coming, but I personally refuse to rely on OnX for anything other than land ownership until Import/Export is added, finalized and tested to be working, because I don't want my stuff locked and inaccessible within a proprietary platform. And, they're still shaking out the bugs from the latest upgrade where a lot of people lost some of their content...