macbook pro retina 13'' vs 15''

I am looking at a macbook pro w/retina for Gopro editing and am wandering if a macbook pro retina 13'' with all upgrades. i.e(3.0GHz dual-core core i7 processor 512gGB flash) or standard macbook pro retina 15'' would be best.
I think the 13'' because it seems like it would do and it is cheaper?
Any other opinions out there? thanks

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