MBA screen
Not to confuse the issue further, but there is an issue with the MBA screen you should be aware of. In comparing it in person (highly recommended) with that of a MBP, you may perhaps prefer itbut possibly find the unit you purchase NOT the same.
The unfortunate reason because Apple apparently sources the screen for the MBA from different manufacturers. There is one seldom used, and seemingly little liked, but those principally used are either from Samsung or LG. Most seem to prefer the Samsung screen, feeling it is brighter with better contrast than the LG version.
Unless buying a MBA in person, and checking prior, there is no way to know which screen you'll end up with. Many consider this dilemma a lottery of sorts. One has the option initially of returning a new MBA they are not satisfied withand more than a few dobut still a pain, and then quite possibly no way of knowing what the next provided will end up being.
There is a fuller discussion of this on Macrumors at the following link. A few elsewhere, but page 7 has a number of comparison pictures provided:
https://forums.macrumors.com/threads/1389918/
Another consideration may be the keyboard. Try this in person as well. Most, me included, feel Apple provides quite good keyboards. Although the MBA in being thinner is said to have somewhat less depth in keystroke versus the MBP. No idea on this, as at a glance they seemed much the same to me. If again, this may matter to one.
Back to screens for a moment. One may perhaps be tempted to just fling up their hands at this and fork out for a new 15" retina MBP, and lug that around. If possibly no more satisfied. There are discussions elsewhere about new RMBPs with at least four dead pixels, ghosting, or areas of light bleed. Others of course with no obvious problems and loving it. So ones experience may vary, and even in this no guarantees.
The closest one may come to that would be the standard 13" and 15" MBP, with screens many like, if often feeling the resolution should be higher. That is why some favor the Airbut on examination have second thoughts. Or not.
In any event, on any new purchase inspect the screen, and all else, closely. With a sad fact of life being prepared to immediately return it to Apple (within 14 days, asap basically) if any defects found.
Beyond that, you'll probably love it.