I like watching greystillplays, because of the antics he pulls with the game. It is pretty funny overall.
I don't really like how Sims 4 Youtubers are just doing builds, and if they aren't doing that they are doing a 100 baby challenge. 100 baby challenge isn't bad, but they seem to be everywhere.
The Sims 4 videos I end up watching are a lot of CAS ones where a person sees what potential offspring will look like from humans to pets. They did one where they randomly generated Anna and Kristoff from Frozen and then another one where they compared Anna with Kristoff and Anna with Hans. They did other videos, but with Youtube simmers only focusing on builds, I tend to look at other Sims 4 stuff.
Also, I only picked up Sims 4 almost a year ago, so things are still kind of new to me. I've seen it since it has been out, but only bought it when Cats and Dogs was released.