Personally, I like the 2 hatch in Mazda-trademark Green over the Fiesta in its trademark Chili Orange. Like what tidus mentioned, the 2 appears sportier or projects a sportier image than the Fiesta, which for me, projects a little more serious image. More fun than big brother Focus, but a little more serious than the 2.
Once you start crunching some figures and consider your brood in the space requirements, though, it's goodbye 2 for me, what with its limited boot space. The Fiesta, though no Honda Jazz, has more room.