I agree on the lack of a clear leader here. I own 3 of the 4 sensors that you have listed and they each have their idiosyncrasies.
PlantLink is a great product but the manufacturer has basically gone under. I have 18 of them and still use them. They are WiFi and quite functional. But we cannot count on further support or development.
I like the Parrot product (have 10 of them) but it uses Bluetooth connectivity to a mobile device and you need to be in range for results. So, walking around your yard to collect moisture data might not be a fun thing.
The Koubachi is interesting and works reasonably well. This is probably your best area of focus as it is WiFi and can report the sensor data that you need. And the company is still in business :-). Not the least expensive solution though but reasonable.
I have not used Edyn.
Hope that helps! Look forward to heading about this upcoming integration!!