A standard website will suit most companies that do not require complex features like a web-store, databases, file processing, etc. The advantage of these websites is of course their price, speed and functional simplicity. You can use it to reach a broader range of customers, connect with social networks and help boost the popularity of your company. To make things clear, a standard website is not in anyway inferior to an advanced one, it's simply a version stripped of the features you do not need.
Advanced websites offer extended functionality like web-stores, databases, file processing, user management, etc. They retain the same great speed and stunning visuals of the standard websites but, for a higher price, they come packed with all of the features that your company needs.