Replying to Full tilt/K2 flex buckles vs cables; benefits and drawbacks?

I am looking to buy FT/K2 F Ski Boots, but noticed the difference of some boots having cables, and some buckles. Is there any real difference?

+ I tried the K2 Method B&E at a local boot fitter and they fit me pretty well, but I am also considering buying used FT 2016 Seth Morrisons (in good condition) instead, but they have cables unlike the K2 ones. So that's what has sparked my interest.
Thanks in advance for any answers.