While I haven't made a scientific comparison of these methods (and I'm not sure I would know how to do so), it always seems to me that when I do a B&W conversion in Lightroom that I get more noise (or grain) than when I use either a B&W Adjustment Layer or Silver Efex Pro inside of Photoshop. This seems like the opposite of what I would expect since, in Lightroom, I am working with the RAW file which I thought would give me the most latitude. I've looked at a number of tutorials here on LuLa, on Lynda, and elsewhere but I don't seem to have learned the magic touch. I'd love to hear whether others have a similar experience or whether this is simply a misperception or a misapplication of the software on my part. Thanks, and Happy New Year!
Jeff