although there are aspects of the alltrails application that I enjoy, I would not recommend going pro when there are far better apps with proven success available for as much as $45 less than the asking price for pro. my choice was made easy by the lack of reviews or a trial period..combined with a ridiculous price tag...
I strongly recommend the Trimble Outdoor Navigator, Pro or Free version for $12. It is a fully developed application, made by a company with a stellar rep in the outdoor community. I rarely find myself wowed by an application or software, usually there are issues I find with menu flow, synchronization, options or support problems. With the Trimble app, I have found myself throughly wowed. I am fairly sure you will be as well. This is one app worth the price, which I also found more than equitable.
Also for your consideration, Backcountry Navigator Pro. For ~$5 this is a great choice for those wanting greater latitude and customization and don't mind/desire a ready made app.
Also check out Atlas Creator for your desktop computer. It allows you to integrate maps from various e-sources and create waypoints, points of interest, and routes. Following your trip you can add pictures, videos, notes and gps data to the map for a complete trip profile.