We tested each of the devices, including their older counterparts, to determine which is the best portable gaming console. Each device has unique qualities, so we used the following criteria for our tests: portability and functionality, gaming capability, media features, online marketplace, and price.

Portability and functionality cover the shape, size, design, feel, and durability of each console, as well as how easy the device is to operate, taking into account things such as user interface and navigation. Gaming tests the control schemes, the screen, and available titles. The media-feature review looks at video and music playback, picture viewing and taking, and applications. We also see how the marketplace for each console works, both on the computer and directly on the console. Our online marketplace tests also evaluate how long it takes to select, buy, and download games and the breadth of available downloads, including non-gaming applications.

Each evaluation, including price, is contrasted with previous models of each device first, then with each other. Final scores are based on these five criteria, and we also give our thoughts about the different consoles and their predecessors.

Because of the vast number of available titles, we use data from Gamefly, a video game rental service in the United States, for DSi statistics, and from Metacritic, which ranks mobile game titles.