Two cameras or one?

i am starting my documentary tomorrow. i will doing my first interview.

the subject matter is pretty serious. i can't decide if i should use 1 camera or 2 for the interviews. maybe one camera has a closeup while the other a medium or wide shot. i expect to end up with a lot of footage with just 1 camera so adding another camera will surely double my footage.

of course i want to make it as visual as possible. i will also have a lot of pictures and newspaper articles to use.

i am interested to know what others have done or what do u think.

thanks!