Last summer I did some experiments between RWGPS and Komoot and ended up using them in different methods:

If I was mapping things out on PC the day before and was in enough populated area - then I liked using RWGPS from my laptop and downloading to my device.

If however, there was an adjustment to plans or it was very sparsely populated then I liked using Komoot from my phone. What I liked was that Komoot had different profiles for Cycling, Road Cycling, Gravel Riding, Backpacking, etc. I wasn't always sure what these settings did but they gave me several alternatives. Also the Road Cycling was less likely to send me on "unknown" roads in sparsely populated states that RWGPS would present as paved.

The other thing I learned was that the cars recording Google Street View in the US seemed to avoid gravel roads so if I asked for a street view and it was missing that also gave me a clue.

I would ride gravel roads where it made sense but also found variations between ones more similar to CO gavel roads I've cycled (*) and others much rougher so it was useful in setting expectations.

(*) When I last lived in CO I printed a large scale map of Weld County and was going through an exercise of riding every road on the county map (~3200 miles total about 20% paved - with good gravel roads, Weld County is approximately the same area as Delaware and Rhode Island combined).