Helicopters provide fast mobile weapon support /harder to shoot down/more uses.Tanks are good but only when u can afford the bill for them lol.A cheap knockoff of the vertibird would be alot cheaper in supply/fuel /resources required to build.Like a earlier post said a vertibird with power armoured units=ass ownage/or even a bombing run
Well, for one, a knockoff of a vertibird wouldn't be cheap. Certainly wouldn't be cheaper than a tank.
Secondly, because aircraft has to be lightweight, they are necessarily fragile. Some of their most vital parts- engines, helicopter rotor blades- by their nature cannot be armored. Plus they burn through their fuel rather quickly and then they have to fly away. A tank, on the other hand, is a mountain of armor. Even if it runs out of ammo and fuel both, it can still provide protection for the troops by physically shielding them from enemy fire.