Logos

In my opinion, Logos is the most powerful of the three.  Logos is when you use logic, or facts to convince your reader of a certain viewpoint.  I am a very logical man, so using logos in my writing comes pretty easily to me.  Logos does not just have to be numerical facts, but you can use words to convince another logically why one option is better than the other.  I love logos, and have come to notice all the times I use it in my everyday life.