I have had both. My wife couldn't pull the trigger on the Smith, too heavy. I now have 5 various LCR models in .22 and 38. I prefer the Ruger, but the Smith worked well for me also.
I've had them both, I like them both but frankly the LCR has a much better trigger. The S&W is priced slightly better, but I'm thinking most people can shoot the LCR better. Trigger control is a big deal. IMO, it's not enough to carry one of those guns. Five shooters should be 2 gun carry. Maybe one of each but which ever carry a good load and have both of them (called the NY reload). I know Evan Marshall the Detroit detective that wrote the books on ammo that are used on the street, he carries 2 guns all the time even now and he's (I'm thinking) 76 now. The nice thing is both are small enough they can be carried in your hand if you anticipate trouble ahead.
I sold my 642 and bought LCR's, I have a mix including 38's, 357 mag, 22 LR, the LCRx3" 38.
I have an LCR357 and an S&W early model 640. They both have great triggers, but I shoot the LCR better. Maybe the XS Big Dot front sight makes it easier to hit the target. I plan on buying an LCR.38 and mount a Big Dot on it too.
I looked at both the LCR and Smith 642 before deciding on the LCR. Checked both of them out for pocket carry, I couldn't see a difference between the two for that. The 642 at a local police supply house was $379, wound up getting the LCR on sale for $359. The trigger makes it easy to hit with, I'm happy with it...
Kinda more like a "brand loyalty" ?????? as noted above ,BOTH really good ,BUT when I handled the LCR with a pair Crimson Trace grips on it,,,,wow,,,,floated MY boat :wink:
A Smith 638 humpback with the old OEM wood grips and Tyler grip adapter is my choice for pocket carry. The grips on the LCR are pretty sticky in my jeans pocket and the finger grooves just don't fit my hand very well. And, to me, a LCR just seems bulky compared to a J Frame. I have a couple of LCRs and enjoy them-I think my favorite is the 3" LCRX .38, which makes a dandy "kit gun".
The J frame's trigger is easy to improve with a spring kit and a little lubrication in the right places.
Both are good revolvers with good reputations for reliability and durability for their intended use.
I personally prefer the S&W 642 just because I have so much trigger time on mine. I started shooting S&W "J" frame revolvers in the 1983's and have carried one since 1988 either as primary or as back up. I started with a model 37 and then a 38 then 442. Currently it's a model 642 and occasionally a model 60.