13 inch macbook pro with retina display vs 15 inch mac book pro?

Hi,
I am a graduate school student and planning to purchase a mac book pro, and I am split between the 15 inch macbook pro and the 13 inch macbook pro with retina display. Beside daily school work and research, web surfing and the normal computer stuff. I will also use it for presentation, some graphic design (Photoshop). Which one should I get??

Many thanks,

Mac

Follow this Question