I’ve got a 2017 MacBook Pro,
That’s the one to go for to be honest,
I don’t think th air will cut it for editing,
Mine gets warm when in Lightroom and editing but manages perfectly,
Also use mine for Final Cut Pro video editing,
MacBook Air really isn’t for labour intensive tasks,
Merely a web browser and emails etc..
save the money and put it to a MacBook Pro will be the best idea