None of this is worth the price.
TomTom continues to have the best maps, but costs for the premium services. Garmin has the best pricing policy, but has hardly special, TMC too slow. Navigon has the most beautiful design, good cards but still far from what should afford a Navi. Becker, Falk and Medion offer a similar picture. Arival I could try even nich.
Conclusion: A special truck Navi, which deserves the name I have not yet seen. I drive weiterhn as for thirty years, with experience.
And the details of my Navis ignore largely. Muted should it draw my attention to congestion (usually you get the message only if you stand in it), and in addition I have a better time visibility.
The rest is scrap.