Novice decision makers choose based on how they feel in their gut. They are unable to explain why they made a decision aside from "It felt right."
Intermediate level decision makers can discern which choices they prefer and why. They are capable of articulating what they want to see in the result.
Expert level decision makers are not only good at articulating what they want, but are also able to swiftly prioritize their objectives. Effective decision making is acknowledging that it's rare to get everything you want; what matters is the ability to identify what is most important and what is not.