VR also allows down load of satellite maps also for offline use. So with the OS maps, all the free maps and an aerial view planning and ground coverage should be as good as you can get. Tracks and routes can be pre planned, swapped, bought, given away etc.
Maps can be stored on sd memory cards on your device, saving on device internal memory. VR can be used offline which I do not believe OS app can.(I don't even have a sim in the phone I use)
Buddy beacon can be switched on ( online only) allowing others to track your walk live, dependant on phone coverage. I have used this but needed to use my normal day to day phone for this purpose.VRs problem is battery usage. I have to carry a battery bank which I carry in the form of a combined solar charger. This is also true of the OS app.