If the question had been rephrased to “What is the best RV navigation system?” My answer would be “Your brain, aided by a dedicated GPS, a phone or two monitoring traffic and road issues ahead, and a person in the passenger seat helping make sense out of the information.”
I start my day with a few minutes looking at a paper map, then enter the destination into the GPS and see what route it suggests, check state DOT sites for construction and closures, make changes as required, then hit the road. When the GPS tells me to do something I don’t expect by using a different road name than I expect, I usually already know what road I’m looking for and am not surprised.