"------Because it's springy, it will almost . . . shrink back to shape after firing."
"-------but at the same time I find that it can have inconsistent neck tension cause once the neck is fire formed loose, then you resize it back down again, it can spring back loose again. If that makes sense to you ?"
Sorry, but it does not make sense to me.
I once got a custom made 243 rifle with a high quality barrel. I had a quantity of Winchester brass which I had previously fored in a Ruger. I full length resized them with a RCBS sizing die.
They would not go into the chamber of the new 243. Factory loads chambered perfectly.
The solution was to anneal the old cases, then when sized they went into the chamber perfect, because the brass stayed where the sizer pushed it. This may fiit the description of Winchester brass being springy, but later I had to do the same with other brands of brass.
I have used all of the common brands of brass and, for the ordinary shooter and reloader, I don't think it matters one whit, what brand you use.
I suppose if I were going to enter a world class competition I would get the "best" brass I could buy, whatever that is. Other than the evenness of the thickness of the neck, I would like to know what other qualities brass could have that would deter from the accuracy of the cartridge.
For all other shooting, even for making key board groups, I would just use whatever I had, or could get.
Softer brass just goes longer before it needs annealing, while harder brass may need annealing sooner, but I can't say that any one brand of brass lasts longer, or doesn't last as long, as some other brand, if they are all properly used.