Apple maps is a huge piece of crap, but I love how it integrates into the OS and into the lock screen, google maps may have better navigation, but its a poor app compared to apples. Once apple maps navigated me to a dead end and actually proceeded to tell me to get out and walk across a field with a stream to reach my destination. Just today I asked it to guide me to the nearest babies r us, and it led me to the toys r us corporate center, the security guard at the gate was pretty amused.
As for the screens, not sure which you are looking at. They are both nice screens, the iPhone is very accurate but a bit cold, the g3 and note 2 are also nice and over saturated which I don't mind in the least, but washed out, not at all. Honestly I don't see either as better, just a little different. I think websites look nicer on the iPhone in terms of color (not screen size) and games look better on samsung screens.