Both bags are designed to protect your gear, yet are so light and compact that you can take them anywhere. You can see a quick tour in this short video featuring both bags in use with Olympus PEN cameras.
Another online tool to help you find the perfect bag is the Lowepro ILC Fit Chart that matches the right bag for your particular camera set up.
Video recorded with a Canon EOS 60Dwith a Canon 17-40mm f/4 zoom and an external lapel mic. I used iMovie '11(which is part of iLife '11) for titles, final production, and uploading to YouTube.