I hope you wont take this the wrong way, but can you elaborate on why you feel Tollef's parallel (from moreutils) is better than GNU Parallel?
It was addressed elsewhere in the thread. My take is: 1/ it's written in C. 2/ it doesn't suffer from feature creep.
The code is 427 lines of C. GNU parallell is 10k+ lines of perl. Considering mmstick compares the loading times, it's easy to see where the difference comes from.