Re: Which KM is the best?
Durability. But i'm not talking about brass being better, it's most likely not better then real stainless steel. BUT, thee ones with the brass in the stem are made better and are much sturdier. The heart is one solid piece as well.
Take for example a standard chiller. It isn't even soldered together to the shank, it's just folded. I have had 2 of them that eventually developed leaks from poor construction, normal use.