13 vs 15" Retina.  Quad or Dual Core for Aperture and IMovie?

Does iMovie or Aperture take advantage of quad core?  I'm debating if I should return the 13" Retina I just purchased for the 15".  Thanks

A quad core will definitely allow you to stack more layers of instruments and decrease your buffer size (resulting in lower latency).  I have a 3.06gHz core 2 duo 17" with 8GB RAM and a mate of mine has a 13" i5 with 4GB RAM and we compared how many synths we could cram into 1 patch before we got system overloads.  My mate's i5 easily handled at least 60% more than my machine....I was blown away by how much difference the extra CPU speed makes. 
If I were in your shoes, I'd definitely go for the quad core if you want MS to handle (just about) anything you can throw at it.  This will also give you a few more years of use as plugins evolve and consume more and more processing power.  That's one of the main reasons why I splurged at the end of 2009 and upgraded every "power" feature I could when I bought my current MacBook Pro.....I've easily gotten more life and use out my system than most users who bought the standard config at the time.  I've also just upgraded to a 512GB SSD to get some more juice out of my machine to keep me happy for at least another year before I get a new MacBook Pro.

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