I currently have a 15" 2010 MBP with a failing hard drive and battery. I'm trying to decide which MBP to get---either mid 2015 15" MBP? Or 2016 13"? Not sure I can make the switch from 15" to 13" but thought I'd post here to see what others have experienced. (I do photography, film and light music editing, writing (lots of writing so keyboard matters). ETA: Portability isn't an issue but cost is.