Sygic Comments: I may have mentioned above that Sygic, although not free, was reasonably priced. That was then.
Took my 2020 EX-L 2.0 out for a spin and learned that although Sygic indeed showed up in Android Auto, the version was not fully supported without an additional purchase of something called "Android Auto Premium." Well, in for a dime, etc., I paid the additional $53 (this in addition to the $17 already spent for "North America Maps and Traffic"), and now I can run the full program on the car with all the bells and whistles. Well, not quite all, but see below. The program has quite a few useful functional features, but whether it outperforms one or another of the other 3 related applications is not yet clear.
Sygic has a long list of add-on features, each with its own additional fee, and I suspect most of them will not be useful to Android Auto users. One nice feature is that on the phone (i.e., not within Android Auto), Sygic can run in a small overlay window on top of other applications. This is similar to the overlay feature in AmiGO and I tried a few combinations that all worked to spec. However neither the Sygic or the AmiGO overlay works in Android Auto (at least in my version and hardware), but in my wife's car (w/o AA) it allowed me to test that feature, Very cool.
Hope a few others will jump in here with comments.