Cthutube still needs to know what your favorite system is for Lovecraftian and Cthulhu Mythos RPG playing?

I am working on a number of Cthulhu mythos RPG supplements that I at some point want to sell or give away for free. But Im not sure what system I should use. What is your favorite system, and can any publishers tell me what companies are the easiest to work with? Contact me at kesinpa@gmail.com to comment