I find nickel handgun cases seem to split sooner than un-plated cases. But as said, it is not enough difference to worry about. Sometimes I sort by color, sometimes i do not.
Nickel plated cases can be hard on steel resizing dies if not properly lubricated. Since most, if not all, handgun dies made these days have a carbide resizer it is not an issue with handgun cases. But, be careful with rifle dies as they are pretty much exclusively steel.
The plating can gall on the surface of the die and scratch subsequent cases. It is easy to buff out the offending particles on the die surface.