MBP with upgraded CPU or upgraded RAM?

I am considering purchasing a current model (ie. late 2013) 13" MBP with retina display. I am hoping to purchase it at the Apple Refurb store. There are two configurations I am interested in:



MacBook Pro 13.3” Retina - Dual-Core i7 2.8Ghz

Originally released October 2013

13.3-inch (diagonal) Retina display; 2560-by-1600 resolution at 227 pixels per inch

8GB of 1600MHz DDR3L SDRAM

512GB Flash Storage1

720p FaceTime HD camera

Intel Iris Graphics



MacBook Pro 13.3” Retina - Dual-Core i5 2.6Ghz

Originally released October 2013

13.3-inch (diagonal) Retina display; 2560-by-1600 resolution at 227 pixels per inch

16GB of 1600MHz DDR3L SDRAM

512GB Flash Storage1

720p FaceTime HD camera

Intel Iris Graphics



They both cost the same ($1739). The first one has the bumped up CPU to i7 2.8GHz but "only" 8GB RAM. The second one has an i5 2.6GHz CPU but has 16GB of RAM. Just for reference, if I buy new, the bumped up CPU or the increased RAM cost the same ($200 options).



My question is if I can only get one of these upgrades (CPU or RAM but not both), which is the better upgrade and where might I see a difference when it comes to performance?



Thanks.

via ehMac.ca http://ift.tt/1bcKF8m