I have used both, Serato Scratch and Traktor for hundreds of gigs and never ever had one single crash (first Macbook Pro late 2007, then Retina Macbook Pro late 2013). A friend of mine had the exact same setups and had crashes and problems all the time.
The difference in this case was, that I put a lot of effort into maintaining a proper system and I read a lot about optimizing your setup and he is the kind of sloppy, try and error guy. Whenever he had "crashes" and "problems" it took me about 5 minutes to fix it. Wheter it was a quick run through his traktor preferences, some switched cables or broken/dirty needles.
This is why I think that 98% of all problems with Traktor and/or Serato are from human error and not from the software.
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