Brachiosaur, don't know why, probably because they were 1 of only 3 species in JP1 that didn't try to kill anybody. On a semi-related note, why aren't ancient marine reptiles classified as dinosaurs? They're all huge terrifying lizards.
Sinosauropteryx, kinda niche but it's cute, fluffy, and the coloration was preserved and it's got a cute red panda/raccoon pattern thing going on. Also honorable mention to Therezinosaurus fucking cool giant sloth beast