"The Used 911 Story" by Peter Zimmerman is a good book that might help you decide.
The SC is lighter and according to the book above will go 200-300 thousand miles between engine rebuilds. SC's are often called built proof. The 3.0 SC engine is aurguably the most reliable engine Porsche ever built.
The Carrera is heavier, quieter, smooter, and more refined. Beautiful.
To me, "feeling quicker" equals more fun to drive. I like a more tactile, "raw", driving experience.
That they are about the same price now, 32 years after the SC was built, certainly opens debate as to which will be worth more later.
My choice would be the SC. Where did you say it was for sale?
