Ask my dad, VTECPWR.
He has both...
Mark in his 1991 NSX has been full on it before (but still doing the speed limit of course) and he didnt pull away from my dad THAT MUCH in his S2000.
237HP VS 270, and the NSX has more torque id assume.
And, Casey, stock for stock, the NSX will always be better.
I love the S2000, and the NSX so i am as unbiased as unbiased can get, but the NSX is faster when you get the chance to really get on it.
It also depends on NA1 or NA2 style NSX, and AP1 or AP2 S2K.\\
Also, the NSX (from what i hear...) has more grip/turn in when it comes to cornering.