My preferred mode is Aperture Mode. It's from all these years when the cameras only had aperture priority or manual mode. I'm not saying it's better, I'm just saying that's how I think.
Not long after buying my Canon 7D, I bought a Canon 580EXII flash. Load the camera, load the batteries, a couple of test shots. No problem, it seems to be working. Then I turned around, took another photo and all hell broke lose.
The flash fired, but something wasn't right. Chimping time! Take a look at the LCD, nothing then I hear the mirror slapping down. A 5 seconds exposure. What happened?