Hiya,
I prefer Monitors by far.
The film or documentary you are shooting will end up on a screen. Therefore, it is the best way to actually see how a shoot will look like and whether or not the shot actually works. Also, don't forget, you trying to show a world out of a window! By simply using no monitor at all, it's like directing a theater play rather then a movie as you will have no idea how everything looks later on a screen, and only trusting in your Director of Photography can hurt later in the editing room.
I recommend use technology to your advantage if you have the financial availabilities, it cannot hurt.
If you can't, then make sure you have a look through the cam more then once!
