I have both Interarms and S&W versions. The only bad thing about the S&W is MIM small parts, if you feel as I do about MIM. The Interarms vesion has cast small parts, which I prefer. I make my living making metal parts for industry, replacement parts for broken or worn out, and MIM parts are at the bottom of my list of choices for "steel" parts. They don't deserve the name steel to my thinking.
Having said that, in every other way the S&W is IMO superior, or at least equal to the Ranger made gun in fit and finish. Both types have cast major parts, so no diff there.
Maybe it's the custom checkered grips, but my S&W feels much better in my hand, contrary to what some say. I confess I love my S&W PPK/s, and it is very accurate as someone said.
I guess it is a matter for the individual to decide. One MIM part in my S&W broke, S&W replaced it free. It's too bad manufacturers push inferior materials on us, on the other hand "Steel" MIM parts are considerably better than the latest trend, zinc based alloys.