1) The UI
2) The flexibility of the Modern Android devices
3) The vastly higher resolution touch sensitivity of the modernAndroid devices (try using Oudie with your fingers and not the stylus)
3.1) pinch to zoom, two fingers to pan, etc.
4. The software itself (XC Soar vs SeeYou mobile which is essentially unchanged in a decade)
5) The ability to use cellular broadband data connectivity for a whole host of applications:
5.1) SKYLINES
5.2) Weather
5.3) Retrieve applications
5.3.1) GPS coordinates, etc
5.4) Device integration with SPOT or Delorme InReach Bluetooth connected applications
5.5) etc, etc, etc.
6) The VASTLY superior resolution of this the terrain map.
7) Automatic calculation of Final Glide over terrain.
8) I can go on and on and on and on....