The Gelgoog Commander Type is obviously enough, an upgraded Mass Production Gelgoog that has the ability to equip a majority of weapons that Zeon MS use and has access to a second melee hit unlike the Mass Production Type. Having overall better stats than the Mass Production Gelgoog, the Gelgoog Commander Type has a few minor issues that would stir away a few Zeon Pilots away from piloting this unit. The lack of extra weaponary is an issue that both the Gelgoog Commander and Mass Production Gelgoog have and the fact that the Gelgoog Commander cannot be heavily upgraded as much as it's Mass Production variation.
