These two graphic organizers will help your students organize their thoughts when comparing/contrasting two texts. I model both graphic organizers for my students on the Smartboard, and then I allow them to choose which way they prefer.
The paper assignment I use with these graphic organizers is a comparative analysis (where students use their two summer reading memoirs and analyze similarities in themes, moods, tones, etc. -- they choose one).
One organizer will allow the student to use the "flip flop" method: paragraphs are organized by topics of comparison and flip flip back and forth between text.
The other organizer will allow the student to use the "block" method: paragraphs are organized by text -- you see all ideas from one text first, then the other text second.
This is a great way to give your students options! It can really be used in a variety of grade levels. It also allows students to brainstorm specific details of comparison for each text. On the lines, I have my students write quotes that are a good representation of their topic that they will incorporate into their paper.