Take PRO, nothing on it no lag.
Also choosing between these two models, and the counselor said, "definitely take PRO as it Retina". Took, no regrets, the best monitor of them all on which I worked. After I tried it at a friend's to work on the Air - even after the Retina screen it doesn't look good.
Previously, there were different advantages of these two models - pro was productive(but heavy and less Autonomous), air - light and Autonomous, but less productive.
Now have a pro(13 years):
- a Retina
- higher performance(it's clear)
- weighs 200 grams more Air(periodically work in a cafe and carry)
- Apple has stated that working 8-9 hours at medium brightness and web surfing. In my experience, the figure is similar to the truth. Again, working in a café, before taking a charge(out of habit, before this laptop was a Samsung). Now charging almost didn't take because I am sure that the laptop can withstand almost a full day of work.