Comfort.The monster dre beats are not really that comfortable nor are they that flexible or bendable as QC15, which basically means that they are easier to break. The QC15 have around the ear-fit- cups that adjust to anyone's ear, making it easy to relax and just listen to your music or movie, they are foldable and come with a case so that you can protect your beats by monster, which causes you to worry less if you're going to break them.Price. Price is everyone's major concern when it comes to buying the product even if the cheapest product is the one with the worse quality. I know that I have bought countless numbers of cheap monster beats that only last me for a year or two. Both of these are both pricey pieces of equipment. The QC15 is about a hundred dollars cheaper than the MB, and they are well worth the price.So the winner is... drum rolls... The "Bose Quiet Comfort 15"!