Worm castings contain 5-11 times more nitrogen, phosphorus, and potassium
Better for your garden and indoor plants
Feed the worms and forget about them
Year round composting, even in winter
Don't wait for spring to use it
Not as rich in nutrients
Not as many beneficial micro-organism as vermicompost
One must manage the compost pile every few days
Regardless of scale, one can't manage a compost pile in winter in freezing weather
You can only get and use the compost Spring through Fall. But who really uses compost in the Fall?
With these differences, why do people choose traditional compost?
More than likely their business model is tied to the garbage model: haul it away.
Hauling it away and composting it on their site raises of a lot of issues.
Haul away composting programs don't directly benefit the source of the raw compost. In fact, I would go so far as to say that traditional composting companies should actually pay their sources for the compostables, not the other way around.