How a beacon works is mostly will remind people with RFID. Pretty similar integration makes people forgot to realize the comparison between RFID and Beacon. In fact, both have many different things in term of range to network type.
By how it works, Beacon might be similar with RFID. But avtually, Beacon is an upgrade for RFID. In the cost side, an RFID will cost more expensive than a beacon which can also be more practical since a Beacon can be detected through a smartphone or a reader.