The difference in stats for the skyblast B and the reaver mk 2 is range, BHG weapons have a range 650m+ where as the GMG weapons have the standard range of 600m.
Plus photon weapons have always been better, the junkers photon cannons are way better then any of the liberty rogues or liberty house laser cannons of the same class.
Plus the energy usage means that you can only mount 2 or 3 (depending on the ship) with other weapons, mount more then that and your power gets drained in seconds.
