OpenWrt uses since version 18.06 Candela Tech Wi-Fi drivers for ath10k. In Turris OS 3.x, we are using ath10k, but we wanted to have in Turris OS 4.x/5.x the same Wi-Fi driver as OpenWrt has by default.
If you have time you can read about it on OpenWrt forum here:
There should be some performance boost, but we and somebody else from the community have an experience that there wasn’t the level of stability what we are used to have. That’s why we decided for Turris Omnia to have by default the non-ct variant.