Ted Grant, a Canadian photographer, once said, “When you photograph people in colour, you photograph their clothes. But when you photograph people in black and white, you photograph their souls!”
I do both (because I can), though I do like his thinking. Some images are, undoubtedly, a lot stronger in shades of black and white, and some are glorious in all its colours.
But what’s really important is probably creating portraits that speak of the subject. Capture that smirk they always pull, that twinkle in their eye, that expression that’s unmistakably them.
Capture who they are and you’ll end up with the best portrait.