So what is the difference between a Borg Cube and a Assimilation cube? I saw on a starship chart that Borg Assimilation cubes are really big compaired to tactical cubes.
There's no official reference to "Assimilation cubes" (I'm not sure where that term comes from, the Armada video game maybe?), and tactical cubes were never seen simultaneously with the original cubes for comparison. All we know is that the tactical was a "heavily armed" version of cube.