Maps and navigation: iPad wins
Yes, I know: Apple Maps is a joke, with iffy geographic knowledge and Toon Town-like 3D graphics. The comparison here is not to Google Maps, but to Metro. In urban areas, the maps are fine, and so is the navigation if you stick to car directions and be careful at complex intersections. The turn-by-turn voice directions are passable if you have an iPhone 4S, iPhone 5, or third-gen iPad (earlier models don't do voice). But be careful in your map searches: if you don't specify a city, Apple Maps seems to look in the last city you were in.
The traffic conditions and various map views are nice, and it's easy to print if you have an AirPrint-compatible device