Just got to see a post from Aaron Baker on WomWorld about the same topic, I ranted about some times back. Google Maps Vs. Ovi. Although he is comparing it with Nexus one, which has the voice navigation with it (the prominent lacking factor in Symbian Version of Google Maps), but still he find Google Map more real time tracking. Although I am not convinced that much due to the factor that Nexus one is obviously much highly powered than E72 (with which he was comparing), moreover the differences were only a friction. So, its not conclusive that Google Maps/ Nexus is better about Navigation in cost effective way specially.
Yes!! I am quite a fanboy, when it comes to talking about Google and its services and as I wrote in my posts Google Maps Vs Ovi Maps and Things I don’t like in N900, I sure do over Google Maps imaginary and intuitiveness a lot. Street View, Integration with Buzz and latitude makes it invincible, while Nokia trying to cope up with lots of innovations, integration with Facebook and Ovi, but still I am not sure that there is some continuous tracking like Google Latitude, which could come quite handy like in my case, when I lost my Nokia 5800 (at least there was a possibility), there is anything like street view (although its not available for India till now) or Buzz.
What Nokia has at its best is powerful and rich voice navigation with offline maps, which is the core of the part. Its actually usable than just a play thing. Google provides maps online means if consuming your data channels even if you travel the same road. Yes! Nokia Maps also use bandwidth for A-GPS, but if you compare then its 10 times lesser than Goggle Maps. It means that even if Google starts maps with voice, they still sit behind due to offline nature of Nokia/ Ovi Maps.
So here my opinion is, Google Maps looks good enough, available easily on computers as well and provides many other small/ big thing as well, but still about Navigation Nokia one is better and actual thing. Accurate, cost effective, voice navigation even in Hindi and already built-in your cell. Its like some expert in era and Google one still has to go some way to be a favorable one for mobiles like support for offline maps, voice navigation and in-built compass (if available). For Nokia, I wish they could add something like Latitude, integration with twitter/ buzz and improve their satellite view (I know Google cant be defeated in this side at least).