Garmin's routing has a few subtle features that make it stand out from the others. It lets you select the vehicle type when you do the routing, and based on this, it calculates the route accordingly, car/motorcycle being the obvious, with other noteworthy choices of pedestrian, bicycle, and delivery. I don't think any other retail mapping/routing software does that.

They also have an 'avoids' feature that lets you select sections of roads, as small as individual intersections, that will be avoided in any routing. Very useful, to avoid congestion. In there newer automotive GPS products, they evidently integrate this feature with data obtained from traffic data channels on sat. radio. Haven't seen that work yet, but am really jonesing to.