WebXR video quality seems good. As long as I cannot measure quality or watch both options side by side, I cannot say if equally good or better.
Some essential features are currently missing, so overall I would keep using DeoVR for now even if the video quality was slightly inferior.
For me personally, the major flaw of the current SLR Hub is the significant buffering time each time when jumping 10 sec forward. In DeoVR, I am not noticing any buffering when doing the same. As long as this is not fixed, I would not use the hub on a regular basis, even if it had all features of DeoVR.