How should I write my chapter summary?

My sociology professor asked us to summarize the first chapter of our textbook, which I am currently doing. I just finished speaking to a friend in the same class and she is writing the summary in point form while I am writing it like a small essay. I feel like the essay format looks better, but she thinks hers is more efficient and gets the same information across. Which do you think is more acceptable, or preferable? Does it matter?

Another student did ask if he cared what font, or how spaced or whatever we did. He said no, as long as it’s summarized. But I don’t know. I always thought point form seemed lazy.

It’s due in the morning so calling the teacher isn’t exactly an option.
I’m a bit paranoid about schoolwork as I just went back after three years away and feel rusty. Please just set me at ease, Fluther. :)