DataContracts vs XmlSerializer

Points	XmlSerializer	DataContracts
Control over Types	Strong	Loose
Optimization & Performance	Ok	Good by 10 times
Shows Serialized or not are serialized into XML	No	Yes
Translate	Public props	Regardless of the access modifiers
Restrictions	Hashtable that implement the IDictionary interface	No
Fully trusted code accesses all resources on your machine.	Not	DataContractSerializer being able to access the non-public members of a type is that it requires full trust
		DataContractSerializer incorporates some support for versioning

http://msdn.microsoft.com/en-us/library/aa738737.aspx