Why is the storm on Jupiter much stronger than storms on Earth and why don't the storms on Earth get as big as Jupiter's great red spot
Basically because Jupiter is a gas giant and thousands of times more massive than the Earth. Everything on Jupiter is on a gigantic scale. The Great Red Spot for instance could accommodate several Earths, so that explains why you couldn't have a storm on Earth which came anywhere near that size. As well as heat from the sun, which is what drives the weather on Earth, Jupiter has a massive internal source of heat.