Photon provided a lot of the important points, with the key takeaway being "you will be hard pressed to notice a difference from a general productivity perspective". Both are a massive improvement on the intel macs.
The one concern with buying used is always underlying liquid damage, which the seller can be trying to hide. The damage is sometimes not spotted in a quick buy/sell inspection.
Definitely check every key, make sure the battery is not giving a service error.
And regardless of which one you go with, both of these models are fairly susceptible to screen cracks- particularly from closing the lid on any type of obstruction or debris. Our org has gone back to purchasing Applecare for all new units because of this, after declining the additional warranty for years. Authorized centres will charge around 650 to replace the display on the Air if you do not have warranty.
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