The black Jeti Master is a newer model, and more efficient than the older Jeti white or gold label one (according to Rainer Hacker).
The black one also has a timing mode specifically for the Hacker 2-pole motors (mode 1), while the older red ones have fixed fairly agressive timing best suited for - guess what - Jeti 6-pole motors...
Having said all that in practice the difference is actually quite small and sometimes you can get a good deal on the red ones ...
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