For me, as a mainly Linux user : - build quality ; - general characteristics (screen quality, weight, size factor, build materials); - power/battery

For me, as a mainly Linux user : - build quality ; - general characteristics (screen quality, weight, size factor, build materials); - power/battery life balance (the M1s are amazing); - can be mostly handled like a Linux-ishy thing not too far away from my desktop computer thanks to Nix; - the gorgeous trackpad.