Both are bright, with the 15' measuring 304 nits brightness and the 13' measuring 310 nits. You'll get the same excellent 'Retina' (Apple's marketing term for a high resolution IPS display) quality display with 99% of sRGB coverage and very good color calibration. In our comparison, we use the top of the line $3,200 model with a 2.8 GHz CPU, AMD R9 M370X 2GB DDR5 dedicated graphics and a 1 TB SSD. If you want dedicated graphics, the price starts at $2,499. The 15' MacBook Pro with Retina display starts at $1,999 and it has 16 gigs of RAM, a 256 gig SSD, a quad core i7 processor and Intel Iris Pro integrated graphics. In our comparison we use the $1,500 mid level model that increases SSD capacity to 256 gigs. It's available only with Intel Iris 6100 integrated graphics. The 13' Retina MacBook Pro starts at $1,299 and the base model has 8 gigs of RAM, a 128 gig SSD and a dual core i5 processor. They have the same 0.71 thicknesses, and the 15' MacBook Pro obviously has a larger footprint to accommodate the larger display. (plus the few ounce difference in charger weight). Both models are relatively very portable, with the 13' weighing 3.5 lbs.

Others care more about price or portability. Apple sells both 13 and 15 inch MacBook Pro models, and for some of you the answer will be obvious based solely on screen size.

In Chief (twitter: your heart is set on a powerful Mac laptop, but you don't know which one to buy. 15' Retina MacBook Proġ5' MacBook Pro with Retina Display Tweet

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