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Bulb type. CFLs can but used with any socket. HPS and MH bulbs need special ballasts that push the total cost of one to 100 bucks or more. Plus, CFLs give off less heat, so you can put them closer, and have more variation of set-ups, i.e. you can put CFLs above, to the side, and even below your plants. HPS and MH bulbs don't have that option, so only the top gets the light.
However, I would use MH and HPS if I have the funds and space. I just happen not to right now, so I'm using CFLs instead.
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