Ahem.
When you say EMG, I think you're trying to say, ACTIVE pickups.
When you say NORMAL, I think you're trying to say, PASSIVE pickups.
So I'm assuming your question is "What's the difference between active and passive pickups."
Because EMG is not the only maker of active pickups, and EMG themselves actually have passive pickups too.
Unless you're asking about the brand, which is kind of like asking what's the difference between Adidas and all other shoes and which is better.
Active pickups run on batteries and are said to be quieter and give more clarity. Some also say they are more sterile.
Passive pickups are the opposite.