The tablets are both 200 mm (7.9 in) tall, but that's where the similarities end. The Nexus 7 is 16 percent narrower, giving it a very different look and feel. The Nexus isn't by any means a beefy tablet, but it is also 16 percent thicker than the svelte iPad mini.
Neither tablet is uncomfortable in hand, but one thoughtful little software touch by Apple gives the iPad mini the advantages. If you grip the side of the tablet, your thumb resting on the edge of its screen won't register as a touch. On the Nexus 7, it will.