What is the difference between the two? Can it run YouTube video's on full HD 4k? No lag? Can i watch twitch streams full HD no lag/buffering? APPLE MACBOOK AIR 13,3'' 128 GB - 1,6 GHZ http://www.laptopshop.nl/product/57...ghz.html?_ga=1.211425623.319559632.1457779308 Macbook pro 13 http://www.laptopshop.nl/product/206392/apple-macbook-pro-13.html The MacBook pro is From 2012.