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I've had the pleasurable opportunity to drive both an NSX and (my own) Porsche 911 (an '87) back to back on some good twisty roads. They are different cars and any one person will probably prefer one to the other. (Hint: I'm keeping my 911).
Differences I noted include:
The acceleration of the NSX is superb; strong torque over a wide range (3.5k to nearly 8k RPM). Less shifting. Even with equal horsepower, I am sure the NSX will out-accelerate a 911 because of this.
The brakes of the 911 are susbtantially better in feel, controllability, and (to my subjective sense) in raw stopping power.
The NSX, while "mid engine", actually has *exactly* the same front/rear weight balance as a 911 (40/60). Check it out! When really pressed hard around tight corners, I had more problems with NSX's oversteer than with my 911's, although given equal experience with both, that might change. And this even with those Yokohama tires on the NSX where the rears ...