Choosing Black & White
But preferences are another story. I have red-green color blindness, and probably because of this, I tend to gravitate more to photos with saturated colors. On some level I think because I see the colors better that way, I like that kind of photography. Others prefer black and white photographs. We all have our preferences, and that's just fine. But part of growing as a photographer is trying new things and expanding our preferences. For me, that means in part looking for ways to present photos in black and white.
But if both have equal value, what would make you choose one over the other? I think the answer goes back to the basic rule of composition we've been using throughout this site: simplify to emphasize what's important to you and exclude what isn't. What's important to you in the scene you're shooting? Is it the color? Then by all means keep it in color. Because of my own personal preferences, that' often the case--I want others to see the colors I find so beautiful. But if you're interested in other aspects of your image--the texture of the flower or the, the S-curve of a bent leaf, the patterns created by raindrops on a fern--consider presenting your photograph as a black and white image.
Then there's also that intangible "feel" of an image, and sometimes the photo just feels right in black and white.
Now many of your cameras have a black and white mode. DON'T USE IT! EVER! There's absolutely no point in it. You want to record as much data as possible. And believe it or not the color data you record can be very helpful to you if you decide to present it as a black and white Use your software to convert it to black and white, and then you can change the brightness of the different colors in your image to adjust the brightness of different parts of your black and white photo. If you only record black and white pixels, you lose the ability to be able to do this. And if you decide later that you want to display your photograph in color, you can't.
Great Egret is mostly white anyway, aside for the yellow-orange in the beak. So I thought I'd see how it looked in black and white. I immediately liked the feel of the image more in black and white--it has a more somber feel to me. So I played with the color channels until I liked it and presented it in black and white.