Full colour? Black and white? Which do you prefer?

Since we are mobile photographers amongst each other here, and smartphone photography has come quite close to professional standards, I have a question for you. Do you prefer shooting in full colour, or black and white? And if you do like a black and white result, do you work with your full colour shot, or shoot black and white right away?

I had to look it up. I was the Canadian photographer  Ted Grant saying "“When you photograph people in color, you photograph their clothes. But when you photograph people in black and white, you photograph their souls!” It's been quoted so often I guess it must be true (I don't photograph people enough).

Recently, I've been having a short conversation about using b/w in mobile photography. With a smartphone, the most obvious choice would be to take all the colour out of a f/c shot, just make it b/w on your PC. But the Nokia 808 PureView and the Panasonic Lumix DMC-CM1 - most likely the very best smartcams to date - both offer the option to shoot in b/w directly. I've never even considered working with it on the 808 PureView, and now - about three years later - I wonder if I should have. 

So I have no experience with b/w photography at all I'm afraid, but I'm tempted to try more - either with the 808 or the CM1. How about you? Is b/w photography something mobile photographers care about? If you do care about it, how - work in b/w directly or edit a f/c result? Whats the reason for your choice? I'd like to invite you to share your thoughts here, and don't be too shy to link to your own results (like on Flickr). 

For now - and as a "hommage" to the great Nokia 808 PureView - I have this simple shot (you'l see why I captured it soon enough) in both versions.

 In this case, I just took all colour out of the original. I wonder which you like most and why, but more important: I wonder how you prefer to work with this yourself - and how, and why. Lots of questions, I know. I'm really looking forward to your reactions - and again, please share your own results as well, thanks!