Do you find this TN handbook useful?

Grasmick's TN Handbook for Canadians: How to Work in the U.S. Under NAFTA

Hi,
I have master degree in Applied physics and also have 1 certificate with 5 years experience, my question is what is the best Category for TN visa, Please help me,

Thanks,

Shaista

Physicist, I would assume, but it depends on what job you get.