Would you rather read The Necklace app in portrait or landscape orientation?

Should The Necklace app be in portrait or landscape orientation? You can view mockup videos for each here: Portrait - http://www.youtube.com/watch?v=Ywf6nuS2cCU&feature=youtu.be Landscape - http://www.youtube.com/watch?v=KKU3F5QiEqg&feature=youtu.be