Opposed to a vegging plant a flowering plant is more mature with a more established root system and the lower older branches are more woody so cuttings taken from a mature plant tend to grow more vigorously to the end imo. Most take cuttings in veg for good reason as well I suspect so I think it is a trade off.
I rooted a clone only Blue Dream cutting this big (not mine)
taken from this 4' clone only mother BD plant (mine)
and the little bugger grew up to be
this 9' x 9'x 9' plant (mine)
Both had equal veg time. (mom and it's baby)