I started the thread without stating what I felt, because I didn't want the thread to come across as an argument one way or another. I should point out that David Ward is an accomplished landscape photographer from the UK.
However, I believe as John does, color is physically easier, but more demanding. Why? We are bombarded with images all day long, almost exclusively color images, it takes a special or unique image to capture and hold our attention for any length of time. For example, is John's image of the Toronto subway; I've seen lots of images of subways before, but the way he uses color in it makes me stop and linger. B&W, by its very lack of color, captures our attention right away.