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Garmin all the way, used in cycle computer mode up the climbs and up high on the mountain where the route is obvious, and only in actual navigation through towns. I was able to stretch my edge touring battery to 13/14h this way. I had a 22000mA battery pack with me that lasted the whole trip (charging phone, gopro and garmin - despite weighing 400g)
The route is simple enough to do without Garmin though, you could have paper maps if you prefer and use your phone as a backup if needed
If you plan to stop at bars/restaurants/cafe or hotels/campsites you can recharge there too
I'm riding this in sep -
what did you do re navigation?
paper maps - garmin? how did you stay charged?