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If your class is stateless and contains a set of utility methods, then you certainly have to use a static class. Consider a normal class in the other cases, but consider using a singleton if a single instance of the object is required.

Here are the difference between static classes and singletons:

	Static class		Singleton
	------------------------------------
	Stateless		Stateful or stateless
	No polymorphysm		Polymorphism possible
	Hard to mock		Easy to mock
	No concurrency risk	Concurrency risk
	Better performance	Lower performance
	Eager loaded		Lazy loaded
	Stored in stack		Stored in heap