These conversations have been spread over many different threads. In my opinion you arent getting lower quality buds from cob's. Different in some ways, but lower quality, nah....
They also produce less big buds because of the lack of far red, which makes plants stretch, and is one of the main features of the HPS and why that light produces some big huge buds. If you look at the video that guy posted all the buds are kinda medium sized, because like
@Afgan King said, the light is more evenly spread out , those also have much less penetration than HID lights because of how spread they are, they are mostly best for growing in a scrog or a very tight canopy with the lower stuff lollipopped. They don't work as well as HID lights for growing big beast plants if you are into that type thing.