I vastly prefer a stand-alone RV GPS. We actually have two, a Rand-McNally which I like because of several additional features such as fuel mileage tracking.
Also we have a GARMIN. I find Garmin traffic superior to any other system, even Google Maps or WAZE - because it works on traffic on my route, and KNOWS my 60 ft total length cannot go onto normal city streets most of the time. I do not care about the major traffic delays on another freeway.
The MAIN reason though is that I tell the GPS the route I want to take. Seldom to I take the GPS recommended route without checking it over closely. They are made to accept my alternative waypoints to shape the route.
I do sit down the night before travel every time and look over the route with the GPS and some checking with my cell phone, and a map, maybe electronic or paper.
For longer tows into areas where I have not been in a few years, or have never been - I check state DOT websites for information on construction on the planned route.
I used Google or Bing Maps and look at the satellite views of major freeway intersections, looking for changes which even apps which Google Maps do not seem to know about. I've seen Google more than once route me though a major freeway intersection to go upon ramps which are no longer present, miss new ramps which are visible in the Satellite View.
The key is that you be comfortable with the device/app, and have a system what you use to ASSIST you in keeping track of where you are and the next turn. Your co-pilot should also be familiar with the system so the driver does not have to make adjustments to the device.
If you miss a turn and feel you are going the wrong way or such. STOP (off of a freeway) and then look at the tools available to help you.