War machine is still a man in a suit while Cyborg has an alien computer fused into his brain.
Plus this is my personal idea but I think that Tony intentionally made war machine weaker than him. War machine is slower and does not have the most advance stuff inside of him. Sure he has lots of guns and rockets but I think that tony is not a great friend and held back on war machine.
Cyborg has a sonic cannon and would probably overtake stark technology
Cyborg has to win because he has alien data in his machinery while War Machine is just another Iron Man. Maybe two Iron Man's could win him out but just one would not do so good of a job around there. So I betcha Cyborg is going to win this one.