As has been mentioned above I expect (just skimmed it):
RCA - Always unbalanced, even if there is a different connection on one of the ends. Lower output (quieter)
Jacks - Either balanced (two black stripes on tip), or unbalanced (1 black stripe).
XLR - Always balanced
Unbalanced cables will be more susceptible to noise from longer cable lengths and external factors (other electronics in the vicinity, bad power supplies, dodgy lighting etc), if yours are quiet, no bother, but changing to balanced cables is generally the first port of call if noise starts appearing in your signal between interface and monitors.
As mentioned above, balanced cables will also give you a little more output, allowing you to not have to drive your monitors as hard.
Si