Brood size conversion

[Red Bee]

So I'm thinking of trying out a Langstroth hive. I run 14 x 12's and like the bigger brood box, my question is what size Lang BB box would be the equivalent to the 14 x 12, medium or jumbo?

Thanks

 

[Black Comb]

The jumbo is the closest. Run 9 frames + dummy b and you have a similar no. of cells to a 14 x 12.
The jumbo box is 0.75" less in depth than the 14 x 12.

BB depths
14 x 12 - 12.5"
Jumbo L/s - 11.75"
Standard l/s - 9.44"