What is the difference between the 2 ad managers?

Hello, i am trying to get an ad together, and i dont know which manager to use.

https://www.facebook.com/adsmanagerThis is the standard manager, where i get these estimates for $5 ad spend:

Potential Reach:
7,700,000 people

Reach
553 - 1.6K

Link Clicks
16 - 55



And this is the simplified ad manager at https://business.facebook.com/
I get these stats here:

Potential Reach: 16,000,000 people

People Reached
578 - 1.7K

Link Clicks
88 - 255


Which one, if any of these is closer to reality?
The targeting on both is the same, Lebron James.