if you're new to road biking, any of the 3 will do..and it doesn't have to be disc.
the cannondale caad12 is also very nice
yes I'm totally new to road biking, from MTB...
regarding disc brakes...i have a psychological trauma with rim brakes...due to a gnarly crash which was caused by rim brakes in a MTB...hihihi that's why i would prefer discs
CAAD12 maybe...if I get hooked in this bike discipline....future upgrade perhaps