This topic has been overdone a zillion times
May i also suggest that you use the search function before you ask any question, you will be amazed by the amount of utter crap and usefull topics.
Altogether some Cargo rats may feel intimidated an insulted by your question because it tends to imply that the position of a cargo pilot is degraded compared to the SLF pilots.
Some Cargo rats may feel even superior beeing what they are.
Good luck with
this