Currently my tests indicate that the Harrier buggy that was introduced is almost always preferable to a Lightning tank. Both vehicles don't take small-arms fire, are quite fast, and have heavy weapons attachable. The durability of the buggy is slightly less than that of a tank at no upgrades, but the addition of upgrades tips the balance generally in the buggy's favor. While the tank needs to choose between front, side, top, and bottom (mine) armor, the buggy trades specificity for a general durability upgrade that includes back armor at the highest rank. The buggy is slightly faster and more maneuvarable than the tank, and, while both get speed/maneuvering upgrades, the buggy also gets a turbo boost. This means that the buggy cares less about maneuverability and also about where it gets hit, allowing it free reign to zip in and out of combat. The tank is much less maneuverable, and needs to rely on that poor maneuvering to make sure it is well defended as it engages. These stats punish tank drivers for poor combat positioning, but leave the buggies without any such concerns while having access to comparable weapons, and an additional seat, turbo, and better speed/maneuverability. The one obvious case you would want a lightning is when you don't have an additional person to man your turret, but this is an odd case, because a lone lightning is often a sitting duck, and if you need heavy weapons on your own, you are probably attacking a force larger than you should, and your lightning will be spotted immediately. A player in this position would be more effective in the cheaper, less noticable, flash, making use of infantry weapons.