I don't know which app is best but I can tell you my experience last weekend. I used a Garmin app on my phone and it showed us the basic trail but then we ran into a part of the trail that had washed downhill and was impassable. We could see a lot of other roads that might get to where we were heading but the Garmin app didn't show any of them. We used the google earth app and it was able to show the roads with satellite. We did run into a problem when we got down into a valley between two mountains that the Google wouldn't upload a clear pic. It was just a blur. I don't know if this was a google problem or a no cell service problem. Anyway, I thought that info might help. Good luck.