Unless I am going on a local trail that I know intimately, I generally carry both a topo map and a GPS. In some ways, I still prefer the paper map, although I have been using a GPS for more than twenty years.

Generally, the paper maps are more accurate. Google maps, which seems to be the basis for many folks GPS data, has at least two inaccurate road locations that I have found on very casual inspection. Neither error is so terrible that you wouldn't be able to find your way back to civilization.