I'll be traveling in a few weeks and I would like to replace my not-so-portable 27" iMac (Late 2012) to a new MacBook. My two options that I've been looking after are: 13-inch MacBook Air upgraded to i7, 8GB of RAM, and a 512 SSD. Retina MacBook upgraded to 1.3GHz and a 512 SSD. (Already comes with 8GB of RAM.) I would use it mainly for surfing the web, the new Photos.app, Pages, and very light 1080p (24FPS) Final Cut editing - overall, very light use. Battery life is important to me as I will travel a lot (mainly trains). My questions are: Which has a better battery life? Will I notice a poor screen from the Air even if I come from a non-Retina device? My iMac has 2560 by 1440 on 27" screen. How far are they from a performance-wise perspective? Please remember that I'm looking on the upgraded versions of those machines. For some reason YouTube is full only with regular models. I don't want a 13" rMBP.