on the subject of b&w ...

[kengai]

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With reference to the M10, I can get a b&w with the following modes:
1 shot in raw and then I convert the file with Lightroom;
2 shot in jpeg setting the camera to have the monochrome file.
Which of these two modes gives me the best result?

[andybarton]

Option 1 because you have complete control of the output.

 

The same is true if you want your photograph in colour too.

[jaapv]

OTOH one could set to DNG+JPG and have a choice.

Like Andy implies, I would never use JPG only, unless it is just for single-quick use. (e.g. adding an illustration to a forum post) Even then, I usually don't bother to change the camera setting away from raw.

[250swb]

Use RAW and convert in Lightroom. Not only because you'd get technically better results but you see the world in colour through the viewfinder anyway. Your imagination deals with how it will look in Lightroom in B&W, so no need for doubting your own instincts by chimping B&W JPEGS.

[Jeff S]

DNG/RAW also provides the flexibility to change your mind down the road  regarding editing and rendering preferences, as well as take advantage of any future software enhancements.  Ansel Adams famously reinterpreted his Moonrise prints over a 30+ year period, with the later ones (more dramatic skies and contrast) his most iconic.

Jeff

[Per P.]

Absolutely option 1. But I have a user profile that generates Raw plus a b&w low quality jpg. Using that I see the world in b&w and focus on shapes, lines, textures, etc. I find that helpful for street and other occasions where I know the end result is likely to be b&w. 

[John Miranda]

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Among other things DNG gives more bits per channel vs JPG 8 bits per channel that allows you to adjust tones (curves, white point, black point, etc) with greater latitude.  It also defers sharpening and color balance decisions from having to be made at the moment to your digital darkroom.  

Always capture RAW, regardless of your intent, you may think you want a quick snap, but revisiting that image down the road you may realize you wish you had the best fidelity possible.  Storage is essentially free.