Laytown Cottage Sunrise by Gary Robinson Photography, on Flickr Laytown Cottage Mono by Gary Robinson Photography, on Flickr
The colour adds a lot I think. I can't say why but the wider view seems also to make a more balanced image, though I can't put my finger on what is lacking in the tighter crop.
Shown as a standalone image the mono would be fine but unfortunately when shown alongside the colour picture it comes across as far weaker than it actually is. The colour image is of course excellent.
Like everyone else I prefer the colour version, but I also prefer it framed as is because of the texture in the sand and the line of light along the lip of the san.
Very much agree those textures add a lot, my only suggestion would be to have more of it, and perhaps focus stack the image to have sharp front to back