give each one 15 minutes riding. the answer will then be obvious.
What he said
It did, the Specialized felt slow and ponderous steering and too far forward, the generic 115mm about right comfortable enough, nice and nippy to steer. The Zoom I have found has similar rise is only 5mm longer and is a whole heap lighter, in fact the silver zoom I have with bolts and a steel instead of alloy wedge (which I had borrowed for another stem) is lighter than the generic with no bolts or wedge at all.