You know, I was at the Sun 'n Fun airshow at the end of March (I was helping man the GlobalNavSource booth). Those other apps were also in attendance, and I answered that question a lot :)
WingX and FF are both great apps, but one main thing is we really tried to tailor the app to in-flight use, as opposed to preflight planning. You can see this in how we did the UI to give the pilot fast access to the plates (swiping and sets of favorites), and also in how we do the search features (autocompleting searches, nearby and recent airports).
We also have really great maps, and part of this is a legacy from approaching the same problems in both the marine and hiking apps we have worked on. For example, we can compose any base map with any overlay in our app (i.e. VFRs + METAR data, and in the next version of the app, VFRs + METAR + radar). EFB also nicely does a course-up view of the map, which lots of people at the airshow appreciated.
Ah, aren't you the guy who admitted to the ForeFlight founder at the show that you copied their app? I hear you're in for some courtroom time . Why don't you post some screenshots of your airport page and their airport page side by side so everyone here can see your "original" work.
WingX and FF are both great apps, but one main thing is we really tried to tailor the app to in-flight use, as opposed to preflight planning. You can see this in how we did the UI to give the pilot fast access to the plates (swiping and sets of favorites), and also in how we do the search features (autocompleting searches, nearby and recent airports).
We also have really great maps, and part of this is a legacy from approaching the same problems in both the marine and hiking apps we have worked on. For example, we can compose any base map with any overlay in our app (i.e. VFRs + METAR data, and in the next version of the app, VFRs + METAR + radar). EFB also nicely does a course-up view of the map, which lots of people at the airshow appreciated.