Advantages of a locale generated with code page IBM-1047

You might prefer using one of the locales that is compatible with IBM-1047, but not compatible with the MVS™ code page if:

You already use one of the IBM-1047 locales and have made an investment in data conversion and keyboard remapping.
You have a requirement to run, in your shell environment, strictly standards-compliant applications or other applications that do not use LC_SYNTAX. If you want to use a single compiled and link-edited instance of a program in multiple locales, such a program is guaranteed to work in multiple locales only if IBM-1047 locales are used.
You have shell scripts that are used in multiple locales. Having different users operating in various locales that are not generated from code page IBM-1047 requires multiple copies of a shell script, one for each different locale's code page.

There are other important code page conversion considerations when the shell uses code page IBM-1047 and MVS does not; see Code page conversion when the shell and MVS have different locales for that information.