After a certain age people stop asking you what your favorite dinosaur is, and I think that’s sad.
My current one’s the Anchiornis, because it’s in the same clade as birds so it’s in their family tree, and it really looks like a prototype of a bird. It had 4 wings for example, but it already looked very birb-y:
(Figured I’d just turn an earlier comment into an actual post because why not)
If we are accepting non-dinosaur but ancient creatures, my favorite is the anomalocaris :) it’s just a goofy lil guy with a mouth snoot. Plus, they never say no to a snack. (They’re at the end.)