To answer this thread I took a little while studying the profiles of both and in the end I chose Tyra Banks over Naomi Campbell mostly because Tyra has that exotic edge. Look at the below image as an example.
Top Afro American Models (Hover)
I would also pick Tyra Banks over Naomi Campbell. I remember Tyra when she was on the Fresh Prince of Bel-Air TV series. I thought she was absolutely gorgeous back then. Naomi Campbell just doesn't have the kind of look that I consider gorgeous. Sure she is attractive, but Tyra is in a league of her own.