Hello there I need some expert advice on which Mac to go for keeping in view my usage and machine configuration. I'm having trouble deciding which of the two laptops would be a better choice from the point of view of Performance and Longevity (at least 4 years). Both are being sold by Apple as part of their current lineup. 15" Macbook Pro - 2015 edition 2.2GHz quad-core Intel Core i7 5th Gen processor Turbo Boost up to 3.4GHz 16GB 1600MHz memory Intel Iris Pro Graphics 13" Macbook Pro - 2017 edition 2.3GHz dual-core Intel Core i5 7th Gen processor Turbo Boost up to 3.6GHz 8GB 2133MHz LPDDR3 memory (I don't mind paying for an upgrade to 16 gigs) Intel Iris Plus Graphics 640 I'm a fairly heavy user. At peak I would be running about 20-25 tabs on Safari across two windows, Adobe Photoshop, Adobe Illustrator, Microsoft Excel, Airmail, Apple Notes & Wunderlist. At mid level the number of tabs would come down to 15, No Adobe apps, the rest remain the same. Maybe add Microsoft Word to the list. My current machine is an early 2014 Macbook Air - 1.4 GHz, 4 GB RAM, which is sluggish at best. My current conclusion is that the 15" inch Broadwell machine would be good enough to handle things today but might slow down sooner as compared to the newest 13" Kaby Lake machine, which impacts longevity (maybe I'm wrong). I don't want to spend a bomb only to regret 2 years later. The quad core 15" does seem appealing to me but I'm not sure if it is a good idea to purchase a 3 generation old processor. Some help please?