Clicking the upper right usually puts the rule at the bottom of the list whereas when you drag the rules you can insert them most easily where you want them.
Another tip I found is that if you click on a behavior that is already attached to your actor, then click the rule button in the upper right, it nests the behavior into the rule.
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Another tip I found is that if you click on a behavior that is already attached to your actor, then click the rule button in the upper right, it nests the behavior into the rule.
But no functionality differences, then? Good to know.