It depends on the application.
RFID usually means passive tags, low cost and no battery needed but maximum range only a few inches.
Zigbee ia a PAN network (the nodes all have batteries) range is many yards.
RFID tags generally cost less ($5?) than Zigbee nodes ($25?) but prices vary with quantity.
With RFID to locate something you must scan it from a few inches away. With Zigbee you can detect it from anywhere in the building.
But, Zigbee does not inherently give any location information
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