I think they are both great - the bw seems to have more contrast which I like. What happens if you do a levels adjustment on the color or have you already done that?
This is a remarkable camera phone shot. I am very impressed with the control of exposure you were able to achieve with this, especially going into the sun. The details and contrast are outstanding, and the image itself has such life and energy. Really good work and if it was in the challenge, would have gotten at least an 8 from me...likely higher.