The 4th Garmin I have owned. In my mind, the Garmins are the best choice for car navigation. A bigger screen is always better. If you can afford it, go big. The Garmin hardware is well made and I had no issues with mounts and connections.
Pros: Solid performance. Had some signal drift under dense canopies, but with clear sky, the gps and maps are spot on. Good quality maps that include most small trail-roads. Relatively standard interface. Much better gps signal performance than my phone.
Cons: Maximize your screen space. This was a 6 inch model, which is barely enough. Having to use reading glasses with the gps is a pain, but the font size cannot really be increased with the small screen. The search tools are ok, but if you add a new stop to your trip, there is not a good way to remove it - when you find out that the stop is too far out of the way. The trip has to be stopped and restarted. My strategy was to google a potential stop first, check the location along the route, and then search and select the new stop. The voice commands were nearly the same between the my phone and the Garmin, so for short trips that don't need a visual map, a phone app has a slight advantage.
To the GPS Vendors: A dedicated car navigation system has a lot of value, but these units should come standard with wifi/bluetooth that link to a cell hotspot. A mobile phone will never have enough screen space for navigational needs. Old peeps are barely able to read the tiny fonts and images on a phone. The screen needs to be big enough to hold a window for the area/regional map without losing the display of the main route. An 8 to 9 inch screen size is needed. An an option to double the font size would have huge value.