You've been told a lot of good stuff.
It's the same stuff, but nickel plated. Plating it seems to make it less resilient, and I have a lot of it split, but I can't remember unplated handgun brass splitting in my lifetime. Nickel is clean and looks good, that matters to me. So does clean unplated brass, if it has been tumbled that's good enough for me.
While I have a pile of nickeled brass in all calibers, I don't use it in anything but .357. I like that the magnum brass is visually set apart from .38, I prefer to have it with that cleaner look as well. I also do that because it's just a habit.
To some people, it's just brass. They don't sort it out, they process it right beside their unplated, and it makes no difference. No difference at all.