The Brontosaurus is a very tall dinosaur. While they aren’t carnivores they are still very deadly. With their teeth most wouldn’t stand a chance. Of course The Spinosaurus is also a very deadly dino and won’t back down in a fight. Brontosaurus would put up a brave fight, but would lose in the end. Spinosaurus wins.
DReager1.com 
Actually Brontosaurus would win(You thought I’d say it was fake? Read this: http://www.popularmechanics.com/science/animals/a14948/the-brontosaurus-is-back/) On topic, Spinosaurus was adapted for hunting large fish, crocodilians and (maybe?) giant aquatic mammals. It wasn’t really built for combat against sauropods like Brontosaurus. Spinosaurus may have coexisted with Paralititan, a sauropod much larger than Brontosaurus, but it likely fed on ill,exhausted, old or young individuals NOT full size adults. The only chance I can think of is if it succeeded in gripping the Brontosaurus’ throat and cutting it and even that would be risky.
Spinos are definitely a lot smaller (About a 20 feet difference I believe) but the Spinos are definitely strong fighters. Especially given how it was able to hold its own against the T Rex for a while in Jurassic Park. Granted, that is a movie, but just as how comic feats help Superman, the movie feats help out the Spino a little. Brontosaurus just seems like he would have a tough time moving around with the same level of agility and quickness that the Spino possesses.
That would be correct for pre-2014 Spinosaurus. Not so for the current Spinosaurus: http://www.prehistoric-wildlife.com/images/species/s/spinosaurus-size.jpg
So then the Spino is actually larger than the Bronto or is the gap by more than 20 feet?
@Dreager1 The scaled spinosaur in the picture should actually be 18 metres so the gap is 4 meters(~13 ft) in length and 2 tonnes in weight, both in favor of Brontosaurus excelsus. Not that it matters because as you can see in the picture, Spinosaurus would be too clumsy on land. On the other hand if the fight was in water, Brontosaurus would drown. So it’s one fight that’s impossible to make fair. It’s like an elephant against a crocodile.
I’m not sure about the Spino being clumsy on land though. Keep in mind the composite nature of the fight and the Spino was fighting very well in Jurassic Park III. I think he could take the Bronto out on land. As for the latter, I’d go with the Elephant B)
Good point but Spinosaurus wasn’t evolved for killing sauropods; it evolved to kill fish.
True, but it did a good job of taking the T Rex down for the count. (I still think T Rex should have won though)
Had this Brontosaurus been a Paralititan, the result would be radically different. This one is understandable, I’ll say that as much.
It’s definitely been cool to watch Dinosaur King lately as I get to see a bunch of different dinosaurs. I’m still not a super expert on the ones that aren’t too mainstream, but it has certainly helped out a bit
Is Dinosaur King worth watching? I love anime and prehistory and it does look good.
Yeah, I’d definitely say so. It’s very formulaic and similar to Pokémon so your enjoyment will really be based on how much you like the main characters. They’re pretty fun I’d say and you get to see the rematch of Spinosaurus and T Rex