I recommend Ace Combat 4: Shattered Skies. Is easily the best balance between story-telling and arcade-style gameplay on the whole series. I would mention Ace Combat 3 Japanese Version but people barely know about it, and other could be Ace Combat 5: The Unsung War, but i think that some people will fall off for the melodrama. And also, looking foward to Ace Combat 7 even if Bandai Namco made other games like Ace Combat Infinity or Assault Horizon. I want a nice lore pls!