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The template method pattern and the strategy pattern do roughly the same thing. I understand the basic differences between them (template method is inheritance based, strategy is composition based), but are there any decent guidelines on when to choose one over the other? It seems like they do basically the same thing.
I use Template method when the algorithm needs knowledge of the internals of the objects it runs on.
In all other cases (i.e. when the algorithm only needs to use the object’s interface), I try to use Strategy.
Further, Strategy is only useful when there are actual algorithms to implement: If the only difference between classes is (for example) what simple value to return, use Template method.