Both boxy designs, but the PS4 is smaller, sleeker and more angular.
Both the XBox One and the PS4 are aimed at being all-in-one entertainment consoles.
The XBox One launches with 13 apps including Amazon\LOVEFiLM, Netflix, Crackle, Eurosport, and Demand 5.
The PS4 offers a similar selection: Amazon Instant Video, Hulu Plus, Netflix, Crackle, Redbox Instant by Verizon, VUDU and Sony's Music Unlimited and Video Unlimited.
Xbox One launch games include Call of Duty: Ghosts and exclusives such as Ryse: Son of Rome, Dead Rising 3, Forza Motorsport 5, Killer Instinct, LocoCycle, and Kinect Sports Rivals: Preseason.
Sony is launching with Assassin's Creed 4: Black Flag from Ubisoftalso plus exclusives Killzone Shadow Fall and Knack.
Evenly matched. Techradar tested both, and said: "Sony's DualShock 4 felt leaps-and-bounds better than the PS3 DualShock 3 controller, however, it was only catching up to comfort already provided by the Xbox 360 and now Xbox One gamepads."
Microsoft's Kinect 2.0 will be able to process 2GB of data per second, analysing more joints, the slight rotation of a wrist or shoulder and your heartbeat.
The PlayStation Eye features two 1280×800px cameras inside a similarly shaped camera bar.
Both consoles feature eight-core processors from chipmaker AMD.
The XBox One frees up greater memory for gaming - 5GB - compared to the PS4's 4.5GB.
Xbox One: £429 including the Kinect motion-sensing camera.
PS4: £349 not including the camera, which will cost an extra £54.
XBox One is out now, the Playstation 4 goes on sale next week.