Different Temperature Readings

Hello I just had a weird situation occur.

I was using AMD Overdrive to monitor my temps so I can compare temps between my coolers (just got a new cooler and wanted to see how much colder my CPU got). I then decided to verify the temp readings by downloading HWMonitor. But HWMonitor temps are around 10 degrees Celsius lower than AMD Overdrive's reported temps!

Why is this? And which report should I trust?

P.S. I was stress testing using Prime95 and i had a max temp of 62 C (which i thought was a little hot considering I just installed a Coolermaster Hyper 212 EVO lol)

Also I plan to overclock but I havent yet.