canuck grower,
molasses is not only good for the plant, but for the beneficials in the soil.
So I'd use it over other forms of sugar.
I occasionally give molasses even in veg for this reason, plus the bonus that ALL plants like carbon. I give TopMax a couple times during veg, even!
The combination of molasses (carbon) plus Sweet and /or TopMax (carbon synthesizers) is great and I recommend it highly. I use all 3.