Also there are diferent grades of stainless steel.

For example you need the highest grade in seaside areas and on boats.

But you can get away with a lower grade inland.

Also in los some unscrupulous....rare I know...people sell chrome as stainless to the unwary.

Other things are the smoothness of the moving parts. Go turn some Grohe taps and then go turn some of the cheap brands such as toto or moderno or whatever it is called, similar.