Which of these should I use?

For CPU temperature:

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Also, for CPU Usage:

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And while not necessary, if you can give me a quick explanation of what the differences are, I'd appreciate it.

Thank you.

Edit: I did a bit of research and found this:

Quote:Digital Thermal Sensors (DTS) are located at the heat sources where temperatures are highest

So I'm guessing to use either Core Max or CPU Package under the DTS section, correct?