Everybody likes Triceratops ( not just girls! ). The armored tank of the dinosaur world. Check out Tundro, who also happened to be my favorite Herculoid.
Yeah, triceratops are just cool.
I was fond of Deinonychus before velociraptors were cool, but my current favorite are the hadrosaurs.
No, you had it right the first time. Pachycephalosaurus was much bigger than Stegoceras.
No, I recalled surprise to learn that the Pachy skull was actually smaller than the Stegoceras skull, the opposite of what i had expected (and had assumed over the years).
In terms of gigantic prehistoric reptiles, it was the sea-going ones that always gave me the shivers. Pliosaur is probably my favorite.
I love apatasaurs but that’s not surprising if you know me. I’m just like one. 
I think the T-Rex is the most popular though.
That’s a hard choice. I’ve been a dino fan since reading the first selection The Weekly Reader Book Club sent: All About Dinosaurs by Roy Chapman Andrews. Even if some of that stuff was wrong–it’s been great fun to follow developments in the field. And to see all that Walking With…. stuff on TV!
My current favorite is Quetzalcoatlus, first discovered in Texas. We’ve got a skeleton hanging from the ceiling in Houston’s Natural History Museum.
Gotta be the Pterodactyl for me. It can fly. It was my favorite in my plastic dinosaur set.
Of course, I always loved the angel best in the Nativity set too. I’m not happy unless something’s flying around.
Not actually dinosaurs. Of course, you wrote “gigantic prehistoric reptiles,” not “dinosaurs,” so I’m not sure why I was going with this. Ah well.
Exactly what I was going to say. The sea monsters are super creepy cool, especially Pliosaur and Megalodon - a shark the size of a city bus!
Wrong.
You too.
Weak.
Lame. Actually, the velociraptor is pretty cool, but you’re still wrong.
Nope.
Nuh uh.
No.
No, no, no, no, no! T-Rex rocks your face, but first, will rip its flesh off and eat it alive. This is what I think of everyone’s precious triceratops.
Oh, and brontosaurus? Total pussy.
Styracosaurus. Do you have enough deadly vicious horns? More? sprinkle sprinkle How’s that? More? Say when…sprinkle sprinkle
I’m a guy, but solidly in the triceratops camp. Nothing says don’t mess with me like those three wicked head-horns, backed by a solid neck shield. If only they hadn’t died out – imagine the shock and awe of a cavalry charge of a solid wall of triceratops. Unstoppable.
The marine reptiles and flyers were totally cool and awesome, but they’re not technically dinosaurs. T-rex is big and toothy, but those tiny little arms are just silly. And sure they were huge, but were they really fierce predators or just overgrown vultures feeding on Jurassic road-kill?
He had ARMOR and WEAPONS! T-Rex had those teeth sure, but come on, those tiny arms!
Triceratops, and I’m a manly man.
The thing is, it’s an herbivore. It’s not looking for trouble. But if you screw with it, it will mess you up.
I think I’m beginning to understand your user name. Just a bit. 
I didn’t like the T-Rex because of Land of the Lost. Not because I was afraid for Marshall, Will and Holly, but because even to my young self it looked totally lame.
I was a Pterodactyl fan, all the way. (That’s what I will continue to call it).
Q: Why do kids like dinosaurs so much?
A: They’re big, and scary, and very, very, dead.
I like the flying reptiles, too, but that is why I did not mention the pterodactyls and it had absolutely nothing to do with them completely slipping my mind.
Yep, tiny arms are silly. I’m sure all the other dinos were constantly mocking the T. Rexes, probably why they had such bad dispositions.