Here is the data from the picture above:
My trusty Digital Multimeter - 8.87V
Keweisi: 8.99V/1.53A
USB Charger Doctor: 7.49V/1.50A
As some of you will wonder, why the voltage reaches more than 5V? This is because of Samsung's Fast Adaptive Charger, and it can go up to more than 5V. There are good explanations here: Link
Here, the charger switches up to to near 9V. Both the current on two USB voltage/current measurement device are almost identical so let's assume they are both ok. BUT, the voltage are different. It seems to me that the upper limit for the USB charger doctor is only up to 7.5V.
Conclusion:
Keweisi is the clear winner here. It can display the voltage and current at the same time and it can measure more voltage than the USB Charger Doctor.
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