One problem I perceive with colour (if you're a film shooter) is the limitations in high speed colour film ... there's not too many choices! I think you can still get Fuji 1600 superior but I don't see it listed at Freestyle or many other places so obviously it's not a hot seller.
My experiences with Fuji Pro 800Z left me a little non plussed ... it's a nice film but exhibits a bluish tinge a lot of the time, particularly in artificial light. Black and white film negates this problem and allows you to concentrate solely on composition and content.