Well what would be? The treacherous Tyrannosaurus Rex, or the gargantuan Brontosaurus, the [i]clever[/i] velocirator? The options are [u] limitless[/u] the choice is yours.
I would be a Spinosaurus, because I have a giant -blam!-ing spine and I look -blam!-ing sick, not to mention I kicked the T-Rexs ass in Jurassic park 3( even though they weren't even in the same era)
Edit1: Type in what kinda of sound your dino would make?
Example: RAWR
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Spinenosoaras