Digital BW, The Print

I know this is a bit off topic but just wanted to get a feel what  
most people think is the correct file to send to a film recorder when  
a black and white neg is being output. Does a 8 bit RGB file (with  
lack of color in it) have more "information" in it then a 8 bit  
grayscale image? I know it will be a smaller file size but is there  
info in an RGB file that would help to make a better black and white  
negative? The software RIP for the film recorder will take either.
Mark