TL,DR version: If you use Ethernet and only need this card for Bluetooth, AirDrop etc., then HB1200 is a good choice. But if you only use Wi-Fi connection, then I'd suggest you buying the T919.
So it's a known thing that if you want seamless Wi-Fi on your Hackintosh, there are two PCI-e options: HB1200 (802.11ac 2x2 867 Mbps) and T919 (802.11ac 3x3 1200 Mbps).
My wireless setup is first-gen Google WiFi (TP-LINK OnHub) in one room and my computer in another, between them there is one wall and one wooden bed. My iMac was able to deliver ~400-500 Mbps of bandwidth in this scenario (but it was located on a table, a bit higher, which is a better place for radio signal).
When I was building Hackintosh, I've ordered both these Wi-Fi cards on 11.11 sale; my plan was to keep HB1200 to myself as I don't need extra bandwidth of 3x3 Wi-Fi module anyway, and sell the T919.
However, the HB1200 (with its default 6 db antennas) was practically unusable. Bluetooth works fine, but the Wi-Fi performance was very weak. I've used macOS Wi-Fi menu with Option key to gather the stats, and something was very wrong with these numbers: TX Rate should not be this low :(
Then I switched to T919... and it just works! Stable AF, stays connected to 5 GHz network and never drops it.
The modules: https://imgur.com/dYsWyHM
T919: https://imgur.com/K2OIeiC https://imgur.com/E2QZSH5
HB1200: https://imgur.com/KSPaTkC https://imgur.com/n2nwMEh
Well then. It's a somewhat useless post, not scientific or objective in any way, just my experience, but hopefully it will be useful to somebody!
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