Digital BW, The Print

Very easy 
> to use and convenient.   

Depends on how you personally think and what you need to accomplish. 

Certain aspects of Qimage are superb, others are awkward. To ME it
seems much less "intuitive" than Photoshop (but some people think
Photoshop is less intuitive...it's personal/practice). 

Until Photoshop CS2, Qimage offered better interpolation for large
prints, but CS2's ahead now. CS2's sharpening tools seem more subtle.

For high production (photo lab) printing, Qimage is superior. But I
don't think you'll find many fine art printers relying on it except
for production printing.  Qimage is better than Photoshop for B&W,
though not even close to QTRgui (Quadtone). IMO IMO IMO