which one is faster/more powerful? I currently own a 15 inch 2.4ghz core i5 MBP(2010) but i am thinking i might return it and get a brand new 13 inch model. Mainly for resale reasons. Obviously a computer 1 year older will never be worth as much, say a few years down the road when i decided to sell. i love the size of the screen but it is considerably heavier than the 13inch model. I just feel like this notebook, since it's a refurb, it's not running on all cylinders. I could be wrong though.... i have had problems with it trying to get Flash to work properly on Safari, it works fine on bother Chrome and Firefox though. My boot up time is about 40 seconds, not sure if that's the norm. I would've thought this babies were significantly faster than PCs but that has not been the experience i've had with this machine.