Monologues V. Soliloquies

Which do you prefer, monologues or soliloquies? In case you don't know the difference, a monologue is given in the presence of other characters, similar to a speech. A soliloquy is given when the character is alone or only in the presence of the audience, similar to talking to yourself. The question is, which one is better? Although Hamlet's "To be or not to be" is a very famous example of a soliloquy, my personal favorite would have to Cher's (from Clueless), "I'm totally, completely, butt-crazy in love with Josh!" It captures my thought process pretty well, plus it's enlightening. And then there are the one's that are confusing, like Chloe's (from Smallville), "I'm the girl of your dreams masquerading as your best friend" I mean technically Clark is there, but he's unconscious. So, is it a monologue if the only person there is unconscious? Or is it automatically a soliloquy? And what about songs, can they be monologues and soliloquies? Because often in musicals people randomly burst into song all by themselves, but would that be a soliloquy, or just your imagination? Hmmmm...