Update 05/19/2020: We’ve remeasured both PC latencies. The test results now show a lower latency on aptX than on SBC.
The Sennheiser MOMENTUM True Wireless 2 have okay Bluetooth connectivity. They don’t support multi-device or NFC pairing, which means that you can only connect to one device at a time, and their PC latency is extremely high. However, on iOS and Android, they have no lag at all when streaming via Youtube, although this app may be compensating for latency. Other apps seem to compensate for latency too, so your mileage may vary in real-life usage.