Should I buy 13 inch Macbook Pro or Air

After researching many laptops including the Carbon X1 among other high end ones I have concluded I will be purchasing an Air or Pro. Supposedly the Air this year will have a light update and the Pro is not due for an update until Octoberish. I need it by mid-June. Should I buy a crappy laptop and wait until Pro is updated or get the lightly updated Air. I wont mind the better screen but I can live with the Air as I also plan to buy the Vizio 4kTV later this year. Your suggestions?