The more animated it is the higher quality it feels like for me but I think that a mix is best since stills are easier to produce and that will help to actually get the updates out.
Animations are nice but I feel like they take way too much time to create if you want some high quality ones that are actually worth the effort. Would rather a dev is able to push out updates more frequently if it means sacrificing some mid ass animations. Only a few ones where it is actually worth the wait
I'd say high quality stills with equally high quality writing would beat a mid quality animation, but the stills have to have that peak writing as well to help our brain do the rest of the imagination.