I think the Butler Maps are pretty Good!! They give you a color code of the roads, then you can connect those to make your routes.
Some of the other sources I've seen use too much of what I call auto routes for getting through the Ozarks that can be clogged with traffic which results in no fun. I think one of the things that makes the Ozarks unique is the possibility of getting off the beaten track and for the most part staying off of it. Plus the roads are better there.