If you want to use Google Maps, you'd need to use Android Auto or Apple Carplay, which it works with (all mk7.5s have that). However if you do that, you can't have the map in between the dials, just on the centre screen.
I like the built-in Navigation system, but its definitely more hassle. You need to update the map manually (new maps every 6 months) and you need an activated data connection for it to get traffic updates etc. But if you go to the bother, you then get integrated navigation between the centre screen and the active dash display.
Hope that makes sense.