Google maps wont work without GPS (or Glonass or other GPS satellite equivalent) or wireless/phone network to sniff it's localtion from.
You are probably deciding between google maps and separate map/GPS navigation application.
As rgd1101 pointed out, Google map has offline feature also, the choice which is better would usually fall upon the user (you) based on what you want to use it for. (and if you want to pay for it, google maps is free, GPS navigation/map apps usually are not or they are "free" with ads)
Edit: offline area should, in theory... suffice unless you go on long trips
Tip: The biggest size for an offline area is 120,000 square kilometers. If you try to save a bigger area, you'll be asked to zoom in to a smaller area.