I use the Tubular fork as well, love it, however the dev has life things that slow down how fast fixes get merged in ☹️ in the meantime I either watch Nebula (or use Freetube on my HTPC as a backup, they tend to publish a fixed build ridiculously fast).
My fav Grayjay feature has to be “polycentric” comments on Nebula videos, pretty cool to discuss with other Nebula subscribers seeing as the official app has no social features