I'm fortunate enough to have both, and as of today (4/23/16), I'd buy the 12.9 because it's more versatile...and a bit faster. They are both fantastic machines, however. My only complaint is the cost and quality (and sometimes weight) of the keyboards that are available. If you want a keyboard, the whole thing is a mixed bag. As of today, only Apple has a keyboard I'd buy for the 9.7, and I don't even like it very much. What I DO like about their keyboard is the thinness, lightness, and most of all, the smart connector. What I detest is messing with the origami that is their design. Bluetooth on Apple has become problematic (have 7 Apple products currently), so the smart connector makes Apple's keyboard worthwhile.