16:9 is of course nicer for watching movies. 16:10 is better for doing work, since it gives more vertical dimension when you are working in Word or composing/viewing a long email, since it alllows you to see more of your document at a time. For the latter reason, I think most (certainly me included) view the 16:10 as a very nice feature of Apple's laptops.
For me 16:10 Retina Display has been crucial feature of MacBook, because it allows me to work on 13" screen without much sacrifice. All 13" 16:9 Windows based laptops were a compromise between portability and usability. Right now I can buy 16:10 Dell XPS, Lenovo X1C, but they either have FHD+ or 4K+ resolution. I am looking forward to seeing MBPR14 which might have a perfect balance of portability, power and screen size coupled with thin bezels. Or new MBA M2 which might be a perfect "budget" EDC laptop.