I have owned both. AirTags are superior to Tile tags in several major ways: (1) the batteries are replaceable (although I understand newer Tile tags also have them); (2) when you get close enough, the Find My app can give you directions to the tag; and (3) there are far more iPhones/iPads out there than Tile users, so if you leave your tag somewhere, its location is much more likely to be found with pinpoint accuracy.