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I’m trying to find some differences between these approaches. Is there any situation where behaviors are used and the same functionality could not be done with attached properties?
No. Behaviors are basically just a much nicer abstraction on top of attached properties.
By using
Behavior<T>, you gain access to theAssociatedObjectdirectly, as well as the ability to attach and detach the behavior, easily, at runtime.You could do this with attached properties, but it would require adding a lot of extra plumbing.