Which drive would give better performance?

Just run a quick benchmark. I actually have the exact same two drives that you have, both the WD6401AALS and the old WD740GD. I'm using the 640GB WD Black as my main boot drive on my current rig and it was FAR faster than my old Raptor - I can't remember the numbers but I recall that the 640GB WD Black was somewhere around nearly twice as quick as my old 74GB Raptor.

-R
 
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