Magicshine is probably a little optomistically rated, but, it will be a lot brighter than the Vision 1.
Mine (Magicshine) will hopefully arrive today so if you can wait a little while, I can do a comparison against the Vision 1's if you want?
FWIW I think a single Hope 1 would be fine for towpaths, it will limit your speed a little but as (I assume) it's all flat, I don't think that will come into it.
The other plus with the Hope is the fantastic customer service and the quality of the light but, it won't be as bright as the Magicshine. Oh, and of course the Hope uses AA's which was another big plus for me.
To put it into perspective, I do a lot of night riding on the MTB and, IMO a single Hope is a little undergunned for that. Two, though, are fine so they are powerful lights considering that we're hooning about in the woods in the pitch dark, hitting at times, 25mph downhill over rough, rooty sections of track.