Do you you mean concrete block ?
Cinder block is actually made with cinders , and not recommended for load bearing situations , more for non load bearing partitions because the cinder block is less expensive to use then concrete .
If you do use concrete block , the holes go vertical , that's where the strength is .
Using wood depends upon the amount and spacing between vertical supports , the more you have the more it can hold .
**cinder block is a darker Grey color then concrete block , and weighs less .
Call a local mason supply for pricing .