I prefer a Michelin road atlas for North America because the maps are tiled (with some overlap) and at the same scale, rather than state by state with scale adjusted to fit the state on one or two pages. I have a better sense of "how far is it" when the scale does not keep changing as I travel. The Michelin atlas I buy is spiral bound to lay flat when open and printed on moisture resistant paper.
DeLorme used to do the same with their state atlases, using the same scale for the whole series. I'm not sure DeLorme atlases are still available, they've been bought out by a GPS competitor.
Folks with weight limit or clearance issues like to use the Motor Carrier's Road Atlas from Rand-McNally to find the roads designated for big rigs and learn about low clearances on those. For a van conversion, clearances and weights are seldom a problem.
If staying within a state, I like to use the individual maps published by the state (usually highway department or tourist commission).
While I find mapping applications or navigation GPS useful to find things locally, I collect maps and prefer to use them for planning and remembering. I usually run a GPS in just a "show me where I am" mode rather than "tell me how to get there."
Edit: looked at my Michelin Atlas of North America, discovered that it is tiled at tow different scales. A larger scale is used east of the Mississippi where population and road densities are greater, a smaller scale in the west. City maps and metro area maps, where included, are a much larger scale.
Tom Test
Itasca Spirit 29B