Wide-margin Bibles are one way to keep your notes, but there's an argument to be made for using a separate journal. A teaching outline can get pretty cramped in the confines of an inch-wide margin. Using a notebook gives you room to spread out. They're easier to write in, too, when your only solid surface is your lap, as is so often the case when you're sitting in church, taking notes on a sermon. Sometimes you don't want to carry all your notes around with you, either. A separate journal gives you the option of leaving them at home.
With that in mind, let's take a look at a few combinations: