GHIDRAH has some stuff more memorable, like Ghidorah's fiery birth, his destruction scenes, the battle scenes. However, some stuff isn't as good, like the puppets used for close-ups, or the "mist breath" for Godzilla. MONSTER ZERO isn't nearly as spectacular but it's very consistent with its SFX. In fact, I'm not bothered by the stock footage, it doesn't produce abrupt time changes like GODZILLA VS. GIGAN.