Old gen vs new. The new is lighter and slimmer and obviously faster. However I miss USB 3 ports on the new one. However the touch bar and finger print scanner is a great addition.
Overall as you can tell computers are getting slimmer and faster as the years roll on!
However the good thing about mac compared to my Windows laptops is that they don't slow down quickly. My mac runs as fast today as when it was new. Hence totally value for money. Yay!