Considering upgrading my laptop at the moment, and I'm trying to choose between the 15" and 13" rMBPs. Assuming storage size and RAM to be identical, which machine is likely to be faster between these two: 13" rMBP 3.0GHz Dual-core Intel Core i7, Turbo Boost up to 3.5GHz Intel Iris Graphics 15" rMBP 2.2GHz Quad-core Intel Core i7, Turbo Boost up to 3.4GHz Intel Iris Pro Graphics Most of the usage will be standard stuff like Office, Pages, etc., but occasionally streaming video to Apple TV, and some use of Photoshop and video editing. The 15" option is 200 more expensive, and I'm wondering if it's worth the extra in terms of power or if the extra screen real estate is the only real upgrade. (The 15" actually does come with more storage, but considering that I mostly use an external HD, that's not a primary concern for me.) I'd appreciate any advice or info!