Ah, really? My feeling (in Berlin) has always been that because of its grip on CDJs, Rekordbox dominates.

But this is a quite unfortunate, at least on my MBP 2014, Rekordbox (and Mixxx, mentioned elsewhere in the thread) send the fans into overdrive immediately while quickly becoming sluggish (just about the last thing you want from a tool for DJing), while Traktor keeps things quiet and responsive.