Hands-on: The Moto Tag is the most capable Find My Device tracker, even before UWB
BookSwiftieAndrew@kbin.run to 
9to5google.com
The Moto Tag is probably the best Find My Device tracker on the market, and that's before you factor in the added future benefit of UWB.
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What's UWB?
Ultra-wideband
In addition to other use cases, it is used to precisely identify where a device is in relation to another one.
With Bluetooth you could probably figure out which room a device is in - it'll get you within a few meters - UWB will help you find which end of the couch it is under, at the cost of only working once you are within a meter or two
I have Samsung's uwb trackers, and they can show precise location at a distance of roughly 15 meters