Maps and navigation: Metro loses
Metro's Maps app uses Microsoft's Bing Maps, which has a longer track record than Apple Maps and no obvious problems. It too has traffic conditions and several map views. If you use the Charms bar, you can print to a standard printer (no AirPrint required).
The Bing-based Maps, though, is also not smart about searching for addresses without a city. Apple Maps guesses wrong; Bing doesn't even try. Either way, you end up having to type in more context.
Bing Maps is weakest in navigation. It doesn't provide voice directions, just the standard panes for each step in your directions. It requires you have a human navigator to follow along.