Yeah, USGS maps are very often poor for vehicle nav since they're so out of date. The USFS topos are much better, and even the landforms tend to be more accurate. And the USFS road markers too (you know, those 4S24 type names). Look at the different types on say caltopo.com and compare. Sometimes old maps are what you want if you're looking for old roads to hike, mines, etc.
The commercial maps tend to have better editing, so one can see what one needs and not a complete inventory of every little track (like some of the MVUMs, which were created just to do such an inventory).
I've found the BC and Alberta Mapbooks to be great, but pricey. There is often more logging and road building going on up there than many places in the States and so they are quite handy to have. They also include POIs, which the gov't maps don't have. Also, I believe the Garmin maps they produce are routable; many of the maps mentioned in this thread don't have that capability since they're raster maps. It's a nice feature to have driving as opposed to hiking where it's not as necessary since you're moving slow.