That's very much where I'm at. Hazbin has that Disney movie tightness of concept and HB is the kind of concept that results from creating the characters to fit an existing lore and that happens to exist in the same universe. Hazbin has a toothier satirical edge where HB has a bit of an Adult Swim vibe, Hazbin has the promise of really good musical numbers where HB mostly has some admittedly cool action animation. I'm enjoying HB and I'm all aflutter to see where the now developing plot goes, but it's the spinoff in this relationship and it's impossible to forget that fact.
They're both incredible in terms of animation, voice acting, etc., some of the best stuff out there. The fact that something like HB is running free on YouTube is nuts.