Any "finish" is less likely to be as durable as stainless steel, but even stainless steel isn't perfect. It can even rust -- but it much less likely to do so that blued steel.
If you like the look of the stainless CZs (I don't), that's the way to go.
I've not seen a CZ nickel finish damaged, yet, and I have several. Seems to be among the most durable of the finishes (Hard chrome is better.)
Nickel can be a problem with ammonia-based cleaners, if one of the underlayers is copper (used to be very common); CZs don't have a copper base, so ammonia is not a problem with them.