Digital BW, The Print

As far as black and white printing is concerned, has anybody in the 
group observed any significant difference in prints from RAW files vs 
prints from JPG files shot in B&W setting? The answer would be 
relevant to memory card capacity. The question came to me reading 
Bruce Fraser's "Understanding Digital Raw Capture" where he 
writes "...JPEG does a decent job of preserving luminance data..." 
that are the data we are after in B&W photography.