Properties of brick and concrete block

Question

i only wanted to know that which one will perform better in case of

1. Insulation

2. strength

3. which is lighter in wt

thanx for help

Answer 1

 for so many years, clay bricks is been used for construction but few years only start using solid / concrete blocks? whats the special in that? why clay bricks production stopped....apart from the clay brick any special thing is behind in solid blocks