Should I buy a new iphone 4 or a used Iphone 4s?

So should I buy a brand new factory unlocked Iphone 4 or a used Iphone 4s? They're around the same price (which is my limit) and my mind is set on an iphone. I'd like the 4s but the thought of buying second hand online feels risky. Which do you think would be best?

Added (1). Just wanna throw in that I know all the specs of the phones, Its just a "new vs used" question:/

Different between are:
Iphone 4S has better Processor, Better Camera, Better Video Quality, Better BLUETOOTH and Better Battery. Now you can choose.
P.S if you know that iphone 4S isn't damaged i prefer iphone 4s else iphone 4

A 100% answer. IPHONE 4.
Apple never has much difference in their modles. But if you want it for business go for the 4s. Bigger processor.

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