For Android phones, Tiles are the most popular option. This also means you get more "receivers", i.e. phones roaming around carrying the Tile app than other Android-based tracker apps.
Tile is all good in busier places but very sporadic in some other countries. Out of interest, I have been outing my tiles in Sydney, Brisbane and Singapore here and there and they get picked up quite well most of the time (e.g. I can track my ferry rides enough to see that I've been on a ferry and whereabouts & when approximately, etc). Also, I saw when my bag was stuck at LHR.
But e.g. in Sweden and Finland, the reception is very sporadic because there probably are far less phones roaming around which would track Tiles. Also in Taiwan, I got a few pings but far from being able to track my moves. The same probably applies to many other countries, too.
This is where Airtags still win: the sheer number of "receivers" is larger and most iPhone users have their bluetooth and location active all the time. If Google manages to develop their own ubiquitous version or standard for Androids (and it gets adopted en masse), the tagging becomes a lot more reliable.