If I wanted single action ability. I would get a 637 and bob the hammer spur. Allow for reduced snag potential when CC and still offer single action ability should one want it.

While I’m sure the 638 is a great gun. That style, in my opinion is the ugliest revolver ever made. All I can think of when I see that gun is Quasimodo- “the hunchback of Notre dame”.

To each their own! Love having choices!