The main reason I chose Wikiloc was that I could pay my full year fee and then immediately close down my card. I hate paying for these things so when the time comes I can choose to renew or not. The reason I chose Backcountry was first for the OS maps and secondly, it was a once-only cost. When I bought it it was less than £5 so it's proved itself by 2020 to be a really cheap buy. For a backup map I like Windy, good for when I'm in towns or villages, it too has trails marked, this time in red. For free IGN French maps with all GR routes clearly marked in purple and so easy to follow, I use Geoportail.