I usually also use my phone and the free and exceptional WAZE app. Nothing beats it. It shows all of the detail/traffic and more than stand alone GPS's. Very good app WHEN cell service is available. It also saves/pre-loads large sections of map so that you can still navigate most of the time when cell coverage goes away. Of course, there are still places/times when the cell service isn't doing it. I then use an old Garmin for emergencies and of course an Atlas or map.
Maybe stand alone GPS software is now better since I purchased my old Garmin but I have never been 100% happy with the Garmin. Even friends with newer units, for example, the units specifically for trucks/rv's, have complained that they are wrong, don't update the maps fast enough, the traffic services aren't reliable or in real time, and they are also sometimes wrong about bridge heights or don't include some etc...
I don't know. I do just fine with a map and my WAZE app.