from what I have seen 10 frames holds just a little more than 9 and 9 frame holds a little more than 8, I run all 9 frames supers.... the reason I like 9 is because the comb gets built out past the top and side bars and it is easier to cut the capping off.... remember when using foundation you have to use 10 frames until they are drawn out because if you was to only use 8 or 9 frames of just foundation they will not draw them out right and will be ugly, once you get your frames drawn out the you can use 8 or 9 frames, after uncapping and extracting honey just store the supers with their drawn comb for next year and just go with 8 or 9 frames then.....