In my case it was Q vs R. For what I was trying to achieve and with my level of statistics background R was an obvious choice.
The language/runtime AND RStudio are entirely free. Give it a try!
Likewise. A good kdb dev is a very rare and intelligent beast, hats off.
I'm just too stupid to be able to comprehend much of Kx's ideas and so R was just much more appealing to me.