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Also question is, what size are drywall screws?
When installing 1/2 inch drywall, nails or screws should be at least 1 1/4 inches long and nails should be of a ring shank variety to provide better security and reduce the chances of “popping”. 3/4 inch drywall necessitates a slightly longer 1 1/2 inch nail or 1 3/8 inch screw.
Regarding this, should I use #6 or #8 drywall screws?
#8 is coarse thread for wood studs. #6 is fine thread for metal studs. For metal studs I usually use the fine thread screws with the self drilling point, but is not really necessary for such thin metal, any fine thread drywall screw will work.
Go for 3/4" plus the thickness of the drywall. So for standard half inch, the 1 1/4" should be fine. When we double up the drywall on a fireproof ceiling, we switch to the 2"+ screws for the second layer. You can go for longer if you have some difficult joists to hit.