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)
Patagotitan mayorum. I think that it’s the largest that we know about - around 40m large. Herbivore, I can’t help but think on it as a dino-giraffe: eating leaves, nesting its eggs, not giving too much of a fuck about the small critters nearby.