ss,
There are times when you need to push a pin, say up near a watch case, when you can't get the bracelet square, in a screw type pusher you will be unable to push the pin into the gap on the other side, it will just push in to the "wall"
With these you can push from above/below the bracelet, and almost always get the pin you want out.
But I still use my screw type more often (and I would do 20 or 30 band jobs a week)
Offshore