I've got a newer (1982) pristine nickel Detective, and 2 first series Cobra's, which are in great mechanical shape, but have been used over the years, so show wear in the bluing.
I love the looks of the DS, and it has a place of honor hidden in the kitchen where my lovely bride of 38 years can access it easily in the event a bg ever stopped by.
BUT, the Cobra's are my choice for personal carry.
Even tho the difference in weight between the steel DS and the alloy Cobra's don't sound like a lot, the Cobra's FEEL like they are a pile lighter..
I generally* prefer the trigger's and trigger actions of any of the Colt's over the J-Frame Smiths I have.
I consider all snubbies to be "last ditch", "get off me" personal defense weapons, so I don't get too excited about the slight differences in trigger feel.
*But if you are plinking, or casual target shooting, then nothing beats the modern target trigger on my J-Frame 638. (With Crimson Trace LG's on it).
But, you just gotta love the old D frame Colt snubbies.
Best Wishes,
JP