I've pretty much been working with the AS400 since it first came out. My programming career started with RPGIII. It's a fine language, easy to write, and for the most part it does the job you need it to. However, when RPGIV was introduced it became a much more versatile language. File & field names could be longer, functions could be used, and many things became easier.
Since I am "old school", I gave some resistance to learning the new language. Once I learned RPGLE, I could hardly imagine having to go back to RPGIII. RPG free actually became ever more versatile, and it's the language I prefer to use.
Just my opinion, but RPGIV is by far the better option to RPGIII.
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