You have to think about the day you use something for defense and then you’re sitting in front of a jury and they are looking at you and the “weapon” you dispatched someone with. Other than firearms I’ve always gone with sports implements for the previously mentioned reasons. LE is hard pressed to drag you off to jail on a traffic stop when you have your kids T ball bat in your car, a nail studded club is another matter altogether.
My daughter just went to college and left her field hockey stick in the garage, so I tossed it in my truck. It’s hot pink and doesn’t look like a weapon, but its carbon fiber, you could beat a battalion of men to death with it and the shape is very functional as a weapon, much more than the T ball bat I used to carry. And what LE officer is going to be concerned by a hot pink field hockey stick?