The point, for me, is I like the darker coloration of the eco and it is less messy than the flourite. I am thinking of setting up a new tank and have a bunch of flourite which I don't want to waste, therefore the adding of more gravel in the form of eco.
Iris, don't think if you use eco, or any other kind of gravel short of a layer of soil, that the plants needs will be met. You have to add nutrients to the water coloumn with any commercial gravel I am aware of.