Once you know the sequence with the buttons, it is a much faster method. And you don't have to go surfing through menus.
Be aware that formatting a card is the cleanest way to remove the digital record. You can also trash the images on the card by hitting the > Playback button, and then deleting individual images are a whole day's worth of images.
The formatting method is more thorough. One disadvantage is that you'll lose everything on the card. So if you have Save Settings, those go to. This is not the same as U1 & U2 User Settings.