If you look at the wikipedia page on defensive gun use, you see that since it’s not centrally tracked and many go unreported

The definition of “defensive use” ranges from “discharged weapon at assailant” to “announced possession of weapon at scary noise”. So much of it relies on taking police reports at face value, no questions asked.

But the real issue IMHO, which is unfortunately not tracked AFAIK, is how many gun crimes are committed with legal guns. IE, legally purchased/owned guns by a non-prohibited gun owner. That IMHO is some data that would really help settle the issue.

I haven’t seen anything to suggest legality of ownership translates to defensiveness of use.

And none of this addresses the central problem of gun ownership - suicide. You are the person most likely to be killed by your own gun.