Galaxy Tab 3 7.0
The littlest of the Tab 3 line, the 7.0 sports a 7-inch LCD with 1,024 x 600 resolution. The chip inside is a Marvell dual-core 1.2GHz processor with 1GB of RAM. There's only 8GB of storage, but you can augment that with a microSD card. Although it's the lightest of the three at 10.6 ounces, its 0.39 inch thickness is actually thicker than the Tab 8.0. It runs Android 4.1 and costs $199.
Galaxy Tab 3 8.0
With its 8-inch screen and ultra-thin (0.29 inch) casing, the Tab 8.0 is clearly targeting the iPad mini. At least this model runs Android 4.2, backed by a Samsung 1.5GHz dual-core Exynos processor with 1.5GB of RAM. Screen resolution is 1,280 x 800, and there's 16GB of built in storage, plus a microSD slot. Price is $299.
Galaxy Tab 3 10.1
The daddy of the line, the Tab 10.1 is notable for being the first mainstream Android tablet to pack an Intel processor, an 1.6GHz dual-core Atom chip with 1GB of RAM. It runs Android 4.2 and has 16GB of storage, plus a microSD slot. The 10.1 is also thinner than the 7.0 — just 0.31 inch — and weighs 1.1 pounds. Like the Tab8.0, the screen resolution is 1,280 x 800, and it costs $399.