Cyber quad cuz :
●Buzzard : so slow
●Hydro is useless
●And falcon : The biggest joke of Mad City : falcon coldown is 15s, only 2 bomb can touch people ( never 3 for one-shot ) in 15s, enemy(ies) can take cover and heal their self, Cobra is little slower than falcon but Cobra can fire missiles, not falcon
So if u want a REAL fighter air-craft wait and buy Warhawk or Nighthawk ( or both )
●But my answer is Cyber Quad for its big acc and his max speed