#WritersCoffeeClub Footnote: fighter v. helicopter duels aren't as clear-cut as an outsider might expect. At altitude and speed, the fighter has the upper hand: but down in the ground clutter, the helicopter gunship can be approximated to an angry flak battery than can suddenly fly sideways at 200mph and duck under bridges: fighter pilots treat them with extreme caution because it's like poking a rattlesnake—you want to use the longest stick you can find.
Yes. There is no single superior weapon in warfare. We need only ask a nuclear power that has faced a guerrilla insurgency/resistance.
Or indeed any nuclear power that (off the top of my head) just happens to be trying to destroy an enemy country the same as the combined sizes of Arizona, New Mexico, Utah, Colorado, and Texas, with building/campus-levelling air strikes.