I've found Organic Maps to be better than any paid app for hiking (and I've tried a bunch) for what it's worth

I find Gaia Maps even better for the boonies.

It has a lot more map data accessible and you can even overlay National Park Service maps, land ownership, accurate cell service grids, mountain biking trails, weather conditions and things like that.

Disclaimer: Just because you see a route on a map, digital or paper, does not mean it is passable today. Or it may be passable but at an extremely arduous pace.

For anything other than driving Organic Maps (iOS) or OSMand (Android) are the very best.