Alliance is my personal favorite of the X-Wing games, mainly because the story is the most... relevant, I guess? It tells the story of a family whose business is taken over by the Empire and is forced to throw in with the Rebels. Thematically, it's not as deep as TIE Fighter, but more emotive and relatable. The flight mechanics are the most improved as well, though it's a bit ridiculous how warhead lock-on is rendered completely irrelevant in relation to capital ships. Dumb-fire, I know.