AeroPod, PowerPod and Newton

I searched the website but and reviews but can't seem to find what the real differences are between the two when used purely for power measurement and not for stroke analysis. The case difference is obvious but is there any other differences that might effect performance?

I did an 11 mile out and back. Afterwards I ran a analyze calibration then a analyze route. The analyze route seemed to yield a better result so I accepted it. It wasn't clear if that sent it to the PowerPod or not. So I went into profiles and it was the last one and I chose "send to device.&qu...