Which profession is better among a programmer developer and a system administrator?

Programmer and developer is same. Between developer and system administrator, there is no right or wrong - do whatever interests you more, both have good prospects for job and career progression.

Before starting career in software industry, I would like to ask you, are you very much confident on any of the programming language. Can you independently handle any language? If your answer is yes, then only think for software development line or testing line. Every line is good, it depends upo