However, unlike xargs, GNU Parallel gives you a guarantee on the order of the output. From the man page:
GNU parallel makes sure output from the commands is the same output as
you would get had you run the commands sequentially. This makes it
possible to use output from GNU parallel as input for other programs.
Want to comment just to stress that this feature is EXTREMELY useful and has saved me from all sorts of tricks with file intermediate output with filenames that match process ids, etc.
