Roherb,
Several years ago I started half my plants in 4" plastic and the other half on coir. At that time I was selling about 700 plants a year, and planting 300. I was surprised to find that the plastics grew faster, but the coirs sold faster. I noticed that people would rather have a 9" plant in coir rather than a 12" plant in plastic.
The black plastic definitely keeps the soil and roots warmer, and the coir dries faster. But if I was still selling plants I would go with the coir and start my germination a week earlier.
-Mike
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