They're cheaper and allows third parties, plus the network is stronger.

There are cheap ($5) devices for Apple's network, if you don't need the UWB support (required for precise location, e.g. when you're within metres of the device but don't know which direction you should go).

I wonder which network is stronger in the UK. There are many recent-ish Android phones with presumably the latest version of Google Play Services. But I don't know if anyone has tried to test, or even to estimate the number of devices.