Before I've bought my Macbook Air M1(8GB, SSD), I've worked on a Macbook Air Intel 1.6GHZ (16GB, SSD) and between these two Macbook a two different worlds of work experience. The MBA with Intel chip struggled of performance, I had often to wait till the simulator opened, fan has often permanent worked, MBA with M1 has no fan. Performance of Parallels it self was bad, often I had to wait when I typed my code down - was often not fluently, not the feeling working on a real device. Since my MBA with M1 parallels it feels like a real PC. Also the battery life time is much better than on the intel based macbook air. I can't provide any measured values for comparison, only my personal experience.The only significant disadvantage in the future could be if MS does not develop or support Windows ARM further.