We only travel with one smart phone (my husband) and one tablet (me) and that is enough. So I load guide books on my iPad.
Not ideal when walking around in towns though, if you need to consult the map in busy streets. But I usually do small paper drawings if I am worried (rarely).
The maps on the travel guides are often wrong or out of date.
So I rely on Google maps, map.me and for Central Asia/Russia the excellent Yandex, to find ATM, banks, hotels or anything really.
The tablet is better as you can then take a screen shot (picture) of the map so no need to have wifi when you need the map. So for me, it's tablet anytime!
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