As I see it, the MBA M1 is "best of" before an update comes and then you do not know how Apple has designed the new computer.
The MBA lacks a fan that collects dust in the computer and can break. It is also completely silent. It has an improved screen. Unfortunately "only" 720p 2020 with improved software. In 2020, the MBA should have 1080p!
Finally, Apple has left the Butterfly keyboard, which has been the biggest design mistake, but still Apple has updated it 3 times before admitting that they would have scrapped the solution earlier. MBA M1 has even better battery life.
If you buy an MBA, you get the "best of" before the update of the MBA comes. Then you do not know if Apple comes up with new design mistakes or if new components can create problems.