I'd have a hard time picking just ONE of my J's as my favorite.
For some years it was my 1 & only J, a nickeled M36 3" HB.
Then, it became a 649 (stainless Bodyguard .38).
Some years later it became the new 642-1 variation of the 642 (I liked that it was rated for a steady diet of +P loads). I also liked that it was significantly lighter to carry than my steel J's or my Ruger SP101DAO.
Over time I added a 37-2, another 642-1, a first production run M&P 340 (with the ILS/lock), and then another M&P 340 (using the excuse that the second one was the No-Lock variation
).
Which one do I carry the most often?
Seems that first M&P 340 (Lock model) has bumped my 642-1's to "second place". Why?
*Better sights. Really better.
*Stronger Scandium aluminum frame
*Lighter in my pocket (holster).
Why the Lock model instead of the No-Lock model (since somebody's bound to wonder)? Because I've been trying to wear it out since I bought it in '05. I've used it as a practice gun to maintain my revolver armorer skills ... It's developed a really smooth trigger from all the shooting ... And, it's become so worn, dinged, scratched, gouged & marred from all the handling, shooting, training, etc, that it's
comfortably worn and I never give its appearance a second thought.
Guess you could say it's become my 'favorite' choice for carry and heavy range usage, but I have other J's I 'like' better.