Light or Heavy, Sweet or Sour crude oil - price difference

What is the difference between Light and Heavy, Sweet and Sour crude oil ? Which of these crude oils are more valuable ?

In general, the main differences between Light and Heavy, Sweet and Sour crude oils are:

• Light crude oil has a lower density and flows freely at room temperature. It has higher price than heavy crude oil, because it produces a higher percentage of gasoline or diesel fuel.
• Heavy crude oil has a higher density than light crude oil.

• Sweet crude oil contains lower level of sulfur, therefore it is easy to refine, more desirable and valuable than sour crude.
• Sour crude oil contains higher level of sulfur, what makes it more expensive to refine.

The most valuable type of crude oil is Light sweet crude oil.