For a potential one off trip, I'd go with some good old fashioned paper maps.
A few reasons - you can mark on the map your trip, make notations about photos, etc.
Grabbing a paper map and looking at it and photos is a great way to have a nostalgia trip later on, somehow looking at a GPS track and scrolling through a saved route just does not do it for me. Will you still have that GPS track in 20 years to show your kids or grandkids? Will you still have digital photos?
I've still got my paper maps from a round Australia trip in 1980, trips around Europe and overland from London to Melbourne and love to have a look at photos and compare them to now.
The larger view of paper maps give you the opportunity to plan and visit places that the GPS will just bypass - often by just a few kms - and you end up missing something that could well be the highlight of the trip.
Plenty of paper maps (road atlasses) show routes that are scenic, show towns that can have some quirky interest, show National Parks, etc.
If you need GPS to find an address, just use Google Maps on your phone.
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