I think round a track the Gtr would ahve the Road maclaren..basically due to the ferocious corner speeds suspension setups and tyres will play a massive role..the maclaren would be setup for the road...softer ride..road tyres=less cornering ability
Vs the super hard gtr setup and racing slicks...
road vs track the gtr would win..however if the macca had a slight modification of its suspension and had racing slciks put on it..well that would be a totally different ball game