People say that nickel brass cases and brass cases have no practical difference. This is absolutely not true.
I used to love nickel brass, and would use it just for the look. Also, if you go to a range that doesn’t like/allow reloads, then nickel brass looks cleaner and newer than brass cases. It’s way easier to make nickel brass look ‘new’.
The main downside with nickel brass is that the nickel is just electroplated onto the brass. Electroplating means that there may be as little as a few molecules worth of nickel on the brass. After a few reloadings, it will flake off into your dies and also your gun chambers, potentially scratching your dies and chambers. Electroplating is very easy to rub off, just carry around an electroplated trinket on your keychain for a couple of weeks and watch it wear off. Now imagine that material being pressed into your dies or blasted into your chamber.
But it makes for a pretty round, though.