In a battle to the death I prefer spiral notebooks, because I can unspiral the wire and strangle someone with it. With loose leaf the best you could do is paper cut them. I prefer loose leaf for everything else though.
If I'm using a binder, then I prefer loose leaf. If I'm just bringing a folder and a textbook to class, then I prefer to have a spiral notebook. I always change it up, too. Sometimes I prefer to have one big binder for everything, sometimes I prefer to have folders and notebooks for each class, sometimes I prefer to have a couple of binders, etc.