« on: February 22, 2014, 09:32:48 PM »
How many images do you need to capture in a session/day/whatever? Personally, with cameras that have a single card slot, I have two equal-sized cards, when one is full I swap them, transfer the images to the computer, and leave them on the second card until they're backed up from the computer. That means have two copies of each image from the time I first transfer them. I format each card when it goes back in the camera. That way, I also have an emergency extra card.
So, if 16 GB covers a shooting period, IMO 2 x 16 GB is better.
As Neuro said, it really depends on what you shoot, its "value" to you and how much you shoot between download opportunities.
I have only ever had one card issue, but multiple cards means you can still get on with your shoot even if it means being a bit more conservative with your shots. Only after I have multiple "off-card" copies do I even consider re-using the card.