Talking about my route planning and the tools that I’m using.
What is better, Viewranger or OS Maps?

http://osmaps.ordnancesurvey.co.uk/
http://viewranger.com/

I don’t mention the OS Maps app because it requires the subscription to be available offline. You only get the standard map with the ‘free’ version.

If you buy their maps you should be able to download that part that you’ve bought (I have not tested this) so I it could be an alternative to the Viewranger app. I feel that the OS Maps app is better at some things but more clunky to use. I also haven’t field tested is like I have with Viewranger hence I can’t make any recommendations based on experience.