People vote for what they have.
642 and 442 have been around for many years, so more people own them or have experience with them. LCR is relatively new to the market by comparison. So S&W will automatically win any poll.
The fact the LCR has as many votes as it does says something.
Personally, I think they are both fantastic but if I could have either would probably take the LCR due to the trigger. But if Eagle wasn't making wood grips for it, I'd take the Smith because I find both of Ruger's grip options for the LCR to be too grippy for CCW.