Which drywall screws to choose
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.  There's no real downside to longer screws other than more work on the drill and more costs.