TargetUpdate VS Update method

If you have a question what is better for use: UpdateRequest with TargetUpdate or Update method, then first of all you must to look at MS CRM SDK "CrmService Common Methods" article.

There was said:

"The CrmService Web service provides a set of methods used to perform the most common operations on system and custom entities. These operations can also be performed by using the Execute method and the corresponding message. However, the methods will perform faster so they should be used whenever possible."

So service.Update is a winner.