Given that the bees will fill the frames to leave only a bee space between
the frames we should technically get more honey from boxes with less gaps.
There is a practical limit from a handling view point and I suspect the
depth that the bees will draw the comb.
 
However from a management perspective nine frames is generally adopted to
provide frames which are easy to uncap with a hot knife. Most beekeepers
here in Australia use nine frames in the honey supers. The number of frames
in the brood box raises yet another set of arguments.....
 
Regards,
 
Paul Roberts
Brisbane, Australia