rmbp. i5 of a 28 watt processor is faster than an i7 15 watt processor. Also, faster graphics. Finally, extra ports.
seriously - you didn't mention the retina screen?
I had 11' and loved it, have 13 rMBP now and there is something that I'm kind of 2cond guessing myself. I just ordered the Air from refurb. store and wanted anyones opinion. Sometimes people bring up points you haven't thought of...
I'll the Air this friday, will see how they stack up
Get the Air if you want the longer battery life, otherwise get the rMBP.
There is literally no other logical reason left to choose the Air with the recently lowered price points of the 13" rMBP (that severely undercut current Air pricing) aside from budget constraints. And that only applies to the baseline stock Air models.