I'll pile on too. You might be a beginner now but when buying a computer think about the future. The bigger screen is going to really be more preferable. I hated going from a 17" MacBook Pro to 15" when doing Photoshop work. I eventually fitted my workflow to the smaller monitor but with the bigger monitor I didn't have to do that. Also consider the RAM I don't know what suites you'll be working in but more RAM is always better for design apps.
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