prin1 / princ vs message ?

[Jean-Christophe Helary]

What's the difference between:

(let ((name "JC"))
  (prin1 "My name ")
  (princ " is ")
  (princ name)
  (princ ".\n\n"))

and

(message "My name is %s.\n\n" "JC")

?

Unless we have a non default value for standard-output both send the value to 
the echo area, right ?

Besides for the possibility prin1 and princ have of printing to standard-output 
and not specifically to the echo area, what is the actual difference between 
the two and message ?

Jean-Christophe