Nickel doesn't take kindly to dents or dings. Never thought of nickel as being especially durable , more valued for it's rust resistance during the black powder days. Even sweat can make it ugly in short order.
My nickel Smith's from the early seventies still look great. They have been holstered/shot and toted much. Sweat/water has never bothered the finish on mine and unlike my blue guns of old the nickel ones don't show holster wear.
Early in my S&W accumillation carear (70's) all I would buy was nickel Smiths.........They have and still serve me well.
I love the looks of the new Classic 58, I wish Smith would make a Classic 520 too........
I am becoming more and more of a fan of the new MIM and IL Smiths, I have 3 of them and they are great. My newest, a Model 66-7, is a tackdriver and has one of the slickest DA pulls I have ever felt.