It always baffles my mind that these apps consume mountains of data, each day about traffic flow, yet can't predict slowdowns. I have one, human speed brain and I could probably estimate traffic jams better than Google/Waze.
Interesting - when I pick a route it typically says something among the lines of "increased traffic at this hour".
It does indeed seem to assume that the traffic situation won't change for the duration of the trip, but I got around that by checking different departure times.
You use both simultaneously? Or if you alternate, based on what?
From my experience? It's wonky. Tap map, zoom out, drag map and then randomly it will snap back (Waze is worse) - it works (for this one task), it's just clunky. Clearly all the focus in car navigation is on the driver, who shouldn't be diddling the screen but it would be nice to have a few features for "navigators" riding shotgun.
I use Google Maps for trips with multiple destinations or extended routes, and Waze for spontaneous, on-the-fly directions when I need to make unplanned stops.