I'm on a Nebula guest pass this week someone generously gave me when I talked about having a hard time finding AI things.
It's a very stark contrast scrolling through the 2 feeds next to each other!
Nebula has a more Fediverse feel. I don't believe it has any kind of real recommendation algorithm, it just has a few suggested categories, like this is Women's Month, so they highlight female creators. Less people contributing, but every video looks watchable even if it's not something I have interest in. The main issue I've had is getting used to a more Netflix looking system to find videos, and just the fact since everything looks interesting, I haven't actually watched much since it's stuff I want to watch when I can actually pay attention instead of it just being moreso background noise. For the $60 a year or whatever it is, it is looking quite tempting.
Scrolling YouTube next to it feels much more like looking at Facebook. Clear algorithm based feed. Lots of mental junk food type recommendations. Real content looks the same as AI. I'm on premium and still have to hear the in-video ad reads. Much more variety (almost no electronic music production or synth type stuff I could find on Nebula, not much on animation, for example) but you have to wade through a lot of crud to find the good stuff.