Stiffness and softness in balsa have a lot to do with the density (lbs per cubic foot) and the grain (A, B, C).
As a general rule of thumb, lighter balsa is softer and more flexible and heavier balsa is denser and less flexible.
All other things being equal, buy for the building need and don't worry too much about the brand stamped or stickered on the plank.
Kit (AKA Cranky Kong)
Total Total Impulse as BAR: 7,753.69 Ns (Equivalent to a 51% M motor.)
=| Calirado, Colofornia...what's the diff anymore? |=