Choose your rectangle Picking a favourite in the design department is a little tricky when you're comparing four glass-fronted slabs, but there are a few distinct differences here. The Google Nexus 7 is the slimmer, more elongated device, measuring a svelte 200 x 114 x 8.7 mm, while the Kindle Fire HDX 7 and Tesco Hudl are a slightly burlier 186 x 128 x 9.0mm and 192.8 x 128.8 x 9.9mm respectively.