There isn't a "best garrison," in my opinion.
Like a game of rock paper scissors, the best choice largely depends on what you're fighting against. For example:
If you are defending against only airplanes, a garrison with only anti-aircraft batteries is best (beneath your defensive air wings

). Tanks are virtually useless against planes and would provide you with zero value in this scenario.
If you are defending against missile attacks, a mixture of missile interceptor batteries and defensive missile batteries is probably best. Anti-aircraft batteries are virtually useless against missile batteries and would provide you with zero value in this scenario.
It all depends.
As such, good garrisons can come as a result of good scouting of your possible enemies and in combination with a number of air defense wings.
F
fadytarek999
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White Giant, country's name: The Great Egyptt