Nikon d3x or d3s best hi iso noise reduction?

Nikon d3x or d3s best hi iso noise reduction camera.example if we set12600 iso both camera take same object.wich camera image good quality & low noise.

Because the Nikon D3s has less megapixels on the sensor, the sensitivity is greater, and you will get lower noise at higher ISO's as compared to the D3x

so D3s