Stegosaurus, but I like all dinos with a thagomizer

Okay, OP, what's your favorite dinosaur? Mine's the Triceratops.

Well I thought it was a Pterodactyl but I have now learned they are not considered dinosaurs

https://www.scienceabc.com/nature/animals/what-is-a-pterodactyl.html

I prefer cats

Sorry but that is not the worst part.

Ankylosaurus!

If you go to the AMA communities, there's always someone that wants to know your favorite dinosaur.

Carnotaurus, love the little devil horns in combination with the derpy little arms

Archaeopteryx is my fave specific dino. Hadrosaurs are my fave group of dinos.

Pachycephalosaurus. I just love those big buttheads.

Out of local patriotism:
Eifelosaurus triadicus

(and because he is really cute)

Triceratops

Megaraptorids are “fun”!

I like anklyosaurus because they got armor and a big old club.