The NSX R will outperform the skyline in straight line acceleration.
From 0-60 its close cause the skyline is soooo fast off the line, a mclaren f1 could not pull on it from 0-20 mph. But once you reach the quarter mile line the NSX-R will beat it. Simple because it has a much better horsepower to weight ration and it does not loose as much horsepower to the wheels because of the mid engine RW against the all wheel drive system.
The NSX-R will also outperform a Skyline on the track. NSX-R is one of the best performers on the world for the horsepower range it is in.
Aftermarket, the Skyline BLOWS the NSX away. With a simple ECU modification the skyline can get more than 35 WHP.
The Skyline looks like a mean tank IMO and the NSX looks like a supercar.