It don't really matter, I have a set of 60 security bits and 18" worth of extensions. If the screw is surface accessible, I don't have the right bit. If the screw is downhole, the collar on the extension is too fat to get downhole.
I had to buy an 8" phillips screwdriver because the shoulder on my screwdriver bits was too wide to fit with a battery powered dragon...
Battery powered dragon, where I come from we just call that a drill or screw-gun.