I suppose sauropods? I like their teeny little heads, perched at the end of goofy long necks, and also the fact that they’re, y’know, huge. More bang for your dinosaur buck. Can’t say my answer has changed over time, since I don’t think I’ve considered the relative merits of Dinosauria before. Despite being in the perfect age group for the first Jurassic Park¹ film, I somehow survived it without developing the dinosaur bug. Probably because every kid I knew did develop the dinosaur bug, and even then I was a contrarian bastard.