OpenCV vs EMGU

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Hi, I am trying to work on an image processing project from the beginning. I need to read a stream from a camera and do image processing stuff like background subtraction and tracking people. 1- I wanted to know which of the two of EMGU and OpenCV would be faster in run? Also there is another module written in C# that gets data from the image processing module. The data is passed through a web service from Image Processing module to the other module. (the data are coordinates of objects) 2- In that case which of these two (EMGU or OpenCV) is better? Thanks in Advance, Ahmad