I'm a long-term (14 years at least - used if for first E2E in 2005) Memory Map user - still as good as it was ..... although a) the licence process is arcane, and b) it's not brilliant on a phone or tablet (although that may be down to my patience or lack of with the licence stuff for multiple devices)
The other systems - Quo, Fugawi, Tracklogs seem to have faded away - but Strava used just as a route planning tool is excellent. I quite often create/plot my route on Strava to download a .gpx and then load that to Mem Map to get a better visual with all the OS 1:50,000 detail.
I've also used the Mem Map IGN 1:100,000 of France extensively .... they seem to have discontinued the mapping for Belgium and the Netherlands which were also useful.
Rob