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)
Oviraptor was originally found together with a big nest of ceratopsian eggs, so it was assumed they fed by stealing those. Years later it was discovered the eggs actually belonged to the oviraptor who was protecting them till death.