Logistics, most cranes have to either be trucked in or moved using their own power. Very few have anything but tires on them. It is much easier to maneuver an excavator over destroyed roads and fallen debris than it is a crane. Plus you have to think about weight rating, rubble often has the be cut up to be moved by crane, most building cranes only hoist up tiny parts of a building at a time and rarely (if ever) move large sections.
Lastly, cranes are much more rare than excavators. I know several people who personally own varying sizes of excavator. I only know two people with cranes
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