TIMING: belt or chain?

In modern engines are often timing mechanism is a toothed belt or chain. What is preferable? In fact, each drive type has its pluses and minuses. The main advantage of the chain of transmission - this is its durability. If the production chain of high-quality materials were used, but its exploitation is going through the observance of all necessary conditions (heavy grease, proper tension, etc.), it can be a very long time. At least not less than the motor. In addition, smaller chain belt, whose width is typically reaches 2-3 cm on the other hand, the chain drive is more expensive and harder to manufacture. Therefore, often it is used in the engines of luxury cars, such as, for example, BMW, "Mercedes" or "Jaguar". Timing belt cost automaker significantly cheaper. Because of this he became widespread in the massive engines available machines. Another strong argument in its favor - at work, it produces less noise than a chain. As for life - minus the main belt, but today, many manufacturers say it at 100.000-150.000 kilometers. And it will agree, is not enough ...