GNU Vs Keil VS IAR VS Eclipse

>>I am fledging embedded system engineer.

I assume you expect to get paid for what you do, right?

To paraphrase Thatcher, eventually you run out of other people's code..

For the warranty, paid support and someone to blame. Probably a reason why we don't have even today and despite the bad experience with the past and current community software, a sane forum software like SMF.