What is the name of your state? Louisiana
What criteria dictates whether a charge is for possession of a controlled dangerous substance or poss with intent to distribute a controlled dangerous substance?
That depends, weight of the product can be considered prima facie evidence of intent to dist.
So can context, like indica of dealing and the like.
However you have not spelled out a scenario / evidence that would provide a sound basis for a robust answer...
Which makes it hard to do any reasearch on LA law.