Halo: Reach vs Call of Duty: Black Ops?

I have not played either game or any of the previous versions. I would just like for some one to tell me which one is best for me. I don't play online but me and my brothers have three controllers so I am wondering if i can play multiplayer and if so which one has the best offline multiplayer. Also in the story mode can me and my brothers play together. Thank you please answer my question please