I need one or the other, but like many torn between the two. Will be using it for movie within on plane travel (economy plus usually), writing, reading of documents (medical), medical image review, lots of emails, photos, etc. I have a 15" MBP now, I take everywhere... thinking 12.9 2nd Gen as I think it would be closer to larger screen (don't like squinting or hunching down). Any advise, good, bad and ugly much appreciated!