Which gunship is best berkut or sea hawk or any other one is better to complete all chapters?

Berkut is a good aircraft because it has multi roles (air-to-ground and air-to-air capabilities) plus it has a missile named DND 74 a missile that does a chain reaction. It will spread another 3 missiles after the 1st missile hits so its good againts aircraft (especially the jets) but its also good at ground units. Sea Hawk is much a little bit weak because of its lack of air superiority. Maybe it has many machine guns but its not enough to take down a fast moving aircraft (unless you are fighting againts a helicopter). The Sea Hawk is only best at ground targets. So i recommend you to buy Berkut.