Comparing a public proxy and a private proxy is like comparing your own telephone to a payphone.
Payphones are used by so many people; on the other hand, telephones in your home are only used by you or the people living in your home.
In the same way, private proxies are used by only one person while public proxies are used by thousands of persons.
When it comes to reliability and efficiency, private proxies trump public proxies.
Public proxies usually don’t work and when they do, they are slow.
Also, Public Proxies eventually crash because they are used by thousands of people.
By using public proxies, you also run the risk of revealing your private information to hackers.
Public Proxies will certainly be overrun because of so many people searching for free proxy servers.
On the other hand, Private Proxies last longer as compared to Public Proxies; they are also a lot faster because they aren’t being abused by the public.
In conclusion, private proxies are more efficient than public proxies because they are used by only one person at a time.