Fair comparison, but there's one big problem with the MB Air, and that's the inability to run x86(64) Windows in a VM for those of us that need an occasional Windows program. I wanted my MBA to be my traveling computer, but it can't until it can do that. I have Windows laptops available so I took a chance on buying the MBA, but there's no way I'm going to buy another one until I can run what I need.
Yes, I know it's a different CPU, but there's always emulation and translation. QEMU via UTM can almost do the job already, but no networking, and it really needs drivers to run in the VM to get decent speed. (Like the VPC additions, vmware tools, ...)
Windows on Arm in a VM isn't an option until 2 things happen -- first being that Microsoft has to decide to sell it as individual licenses, and 2nd, it's got to get a whole lot better!