Aside from the screen, the Air is a bit lighter, thinner,[1] has an equivalent processor, 4x the SSD, is $100 cheaper, and has access to the whole Mac ecosystem.

Again, I'm not seeing the value proposition.

[1] Arguably... this looks like 0.64" all the way across, while the Air tapers from 0.68" to 0.11". In practice I find the taper helps a lot for shoving into briefcases, sleeves, and holding it one-handed.