I used to use Libre + MiaoMiao + Nightscout, but these days I much prefer Dexcom G6 + xDrip + Nightscout.
Pros for the G6:
- No 3rd party transmitter (e.g. the MiaoMiao)
- It's smaller and can go on the stomach so it's less likely to get ripped off
- 1 less app involved -- xDrip integrates directly to Nightscout and there is no need for the Dexcom app
- Supposedly the glucose readings are a bit more accurate than the Libre
Cons:
- Sensors are more expensive than the Libre
- The transmitter is not rechargeable so you need to keep buying them every 90 days
While the Dexcom is "better" (than Freestyle Libre) in my opinion because the recent revision can talk directly to your phone continuously (the Libre only sends alerts, getting data requires you tapping phone to arm)... your insurance may cover only one or other. Either is way way better than nothing, but both are still a long way from automation.
It has a side benefit of allowing them to show it on their Apple Watch using Google Calendar only.