i need one by the end of the week. I'm torn between these for music production: 2015, 15 inch rMBP, quad core i7, 16gb RAM. 2016, 13 INCH rMBP, dual core i5, 8gb RAM. the 2016 is the cheaper, the only reason I'm considering it, is because I'm thinking it'll have a longer life span than the 2015 model, despite the higher specs. I'll be using apps such as Logic, pro tools, abletom, so it needs to be able to effectively manage those applications without hiccups. Advice would be amazing, thanks !