It's about time one of the mags did a review of all this software.
I've played with AirNav pro, Skydemon, Flitestar, Pocket FMS, and Rocketroute.
I think Skydemon is the most user-friendly by a long way but as for actual practical value it's a close call between Skydemon and Pocket FMS.
I like skydemon becaue it's just so easy to use and because of the ability to file a flight plan for international flights right there on the software.
I like PocketFMS because of it's ability to intelligently find an optimum route. You simply put in your departure and arrival points, tell it what you want to avoid and by what margin and it will calculate the route for you. (Thanks to DP for showing me that) and it's ability to create an exportable flight plan to an SD card.
If Skydemon could plan the optimum route and create an exportable file for use in an EFIS it would be a clear winner but for me PocketFMS just pips it at the moment.