Do you mean to just ask for general information, like how easy or hard they are?
Each MSC has its own requirements. Some are odious (I personally think Maritz asks way, way too much for too little pay). Marketforce MS are easy, quick, and the pay is fair, but doing the revealed audit for the same station is, again, way too much work for the offered pay.
If you know the MSC, just accept one and get 'er done. Then you'll know.
Now, if you're asking which companies do these two stations, we can't tell you that.