The Rekognition API differentiates its feature set by processing images to recognize more than just the location of faces. Rekognition's technology will analyze a given photo and present a list of scenes, each with a probability rating. Faces are not simply identified, but are also classified for age and emotion.
We are all likely familiar with the look of YouTube's embedded player. In fact, seeking an alternate design for the player might be what sends many developers to to one of the other 99 video APIs. But it doesn't need to: YouTube lets you add your own "chrome," the look of the player.