snap and quantize, like in Traktor Pro

Quantize, yes, I'm not sure how snap differs as I don't use Traktor regularly.

Basically the snap in traktor snaps the events like cues to the grid and quantize just quantizes the events like cue jumps etc. to the grid... The quantize on pioneer works same like in serato what is imho the best way.. Never seen anyone to use only quantize or only snap in traktor...

It's a global function in rekordbox; on or off, but you can easily and quickly toggle it to your preference, as well as set the quantize value within preferences.

I was just looking through this forum for the same question; been using Traktor for years, and now own a ddi sx, and just subscribed to rekord box to test it out. 

I've been through preferences and not see any way of getting que or loops to snap to grid. 

sorted; set value of quantise to 1, that should sort out the que and loops to snap to nearest grid marker

Where is that setting?

Preferences > Advanced