Since they seem to rely only on dyed mulches, I wouldn't use any of them. Next to a rubber mulch, dyed mulches are the least desirable. And they don't show the size or texture of their mulches so can't comment on that.
Impossible to say how much you need without knowing the square footage to be covered. Whoever you do decide to order from will ask that question to determine how much you need. You want at least 2 inches of thickness,
Q
Great ideas and help.
Q