Macbook Air vs MacBook Pro


Hello macbook repair specialists,

I havw watched many videos from Louis Rossmann doing repairs. I have noticed that majority of laptops he repair in his videos are MacBook Airs. Now is it because Macbook pro is simply that better quality (I'm talking about 2013-2018) or simply more people buy Macbook Air since they are cheaper (at least in this period of time), and therefore more this laptop come for repair?