What's the difference between the beta values 

https://github.com/nicholashestand/Active_Portfolio_Management/blob/96c33598ad0df78dc4c1724296cc66d7fdf291f7/src/Chapter3.tex#L74

Thanks to your solution, it helps!
I have a question. You tell difference between the way it generates.
Can you tell about the difference between the beta value it self?
which is more accurate? why?