The charging pod is a great accessory. It reduces the use of the USB connector which seems to be one of the most common hardware items to fail. Also you can just grab the phone off the pod, check email, answer a call or whatever, and put it right back down. You'll always know where your phone is on the desk and it's easy to see the indicator light for new emails since it's standing up.
With the cable, you have to decide whether to pull the cable or try using the phone with it without stressing the connector. If you're outside the year warranty on the phone, I think it's a prudent investment on top of just being a convenient charger.