If we stick into the realm of western widely-consumed media, it usually comes down to Star Wars or Warhammer 40k or something like that where the writers like to add zeros to every number and don't really understand what it means.
If we expand the realm to the really crazy, there's a couple of animes were giant robots use galaxies as weapons, so I think that probably wins.
Basically, the less the writers pretend to understand reality, and thus the crazier the feats and more zeros are attached to every number, the more powerful the combined forces of the setting are. It doesn't really have anything to do with strategy, tactics, logistics, or technology.