The most interesting game console out this year is Nintendo’s Switch, which plugs into a TV but can also go completely portable, with its own touch screen. What Nintendo gains in novelty, it loses in third-party titles: The biggest franchises are going all out with 4K gaming on Microsoft’s all-new Xbox One X and last fall’s Sony PlayStation 4 Pro. If you like Mario or need portability, pick Nintendo. If you have a 4K set and want to step up your games, visually, try the new Xbox or PS4. Nintendo Switch, $300, nintendo.com; PlayStation 4 Pro, $400, playstation.com; Xbox One X, $500, xbox.com.