There are two Tech 2 Engineering Stations in the game, the Cybran T2 Engineering Station, nicknamed The Hive and the UEF T2 Engineering Station, nicknamed The Kennel. While both are different in use, they both serve to "Get work done", as they both have very fast build speeds when compared to traditional engineers, especially after upgraded. When fully upgraded, The Hive is cheaper and has a faster build rate, but the Kennel's engineers (Rovers) can roam around, outside of their buildings' assist radius, making it a far more versatile building. The Rover's ability to roam around and reclaim or capture land units without fear of reprisal is considered an exploit by some.
Unlike The Kennel, The Hive doesn't have any mobile mechanics that can be destroyed, resulting in having to waste your economy and time to rebuild them. The Hive also has two upgrades, as opposed to The Kennel, which has only one. On the other hand, The Kennel drone rebuild time and resources are quite low. Furthermore, if needed, The Kennel drones can work outside of their automatic operational range, albeit this can only be done manually. The Kennel drones can also perform other tasks while the original Kennel is upgrading, while The Hive cannot.
One disadvantage of the kennel is the fact that its drones fly and enemy ASFs will target them. When the drones are under shields the ASFs will attack the shields and take them out very quickly. This can leave vital structures open to attack from bombers or gunships. Players will usualy send a cloud of ASFs first and then patrol them around the base to distract AA while bombers do the damage on sniped or large scale air attacks, so these drones can actually help your enemy by giving them a way to take down the shields.