Well, I ran both nine and ten frames in brood boxes, nine or ten in supers. Occasionally I ran eight in a brood box by error or when a swarm got above an excluder. (Ooops. there is another contentious matter).
In singles, and making comb honey I always ran ten. It all comes down to convenience and how you work.
The bees don't seem to care and often prefer the trees or somebody's eaves.
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