If you mean the CIA or FBI, neither is better. They have different missions, but often collaborate in areas of common interest.
Notorious
there are actual no spy schools but there is the pentagon FBI and the cia
Master Spy: The Robert Hanssen Story
FBI agent a spy
Fbi all the way!
In the army, you can. You may also work for the FBI or any countries intelligence.
FBI CIA IRS
Notorious
swat
One for inside the nation, FBI, and one for outside the US, CIA.
The word 'spy' is both a noun and a verb. For example:Noun: Robert Hanssen is profiled in the book "The Spy Next Door' by Elaine Shannon and Ann Blackman.Verb: Pretending to be a religious family man, Hanssen used his top-secret FBI clearance to spy on the activities of FBI agents and double agents in Moscow; secrets he leaked to the Soviets over the years for a total of $470,000.
It means someone wants to kill you in a snap or will kill you. So to be an FBI agent is very dangerous.