Are multi cellular organisma more advanced that unicellular organisma. Why or why not

Mutlicellular organisms have cells that have specialized in various functions. Would you call that more advanced?

Since this is not my area of expertise, I searched Google under the key words "cell functions specialization" to get these possible sources:

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http://www.runningempty.org/Steve/Multicellular/Specialization.html

I hope this helps. Thanks for asking.