Contacts: Metro loses
Metro's People app debuted in Windows Phone, where it's one of the key strengths of that uneven smartphone platform. The reason: It's the hub for all your social accounts. It's an address book you can actively use to stay in touch.
But as a contact manager, it's even more basic than the iPad's Contacts app, with far fewer fields available for contact information. There is no groups capability at all. It does let you link contacts, and you can mark individuals as favorites.
All in all, both the iPad and Metro offer inferior contacts apps, neither of which is a winner. I quite like Metro's social approach, but I need at least iPad-level contacts management as well.