I use deep boxes for brood chambers & medium or shallow for
honey production.I always use 2 deep boxes to give the swarm
lots of space.As to why,I would use deep boxes for honey
but,A.They are too darn heavy when full B.The queen like to
keep moving up(I dont use excluders) and C. I have lots of
shallow & medium supers on hand.
 
                  M.L.High