[spoiler]Jurassic Park doesn't count.[/spoiler]
[spoiler]........[/spoiler]
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The one that did the most serious damage to the other one. DUH! Depending on the size/age of the 2 dinos that would compete there is no way to make the comparison. Spinosaurus may have had a size and weight advantage, but it is arguable that being a fish eater would make it probable that it may not have the jaw hinging or strength to get around any of T Rex's vital regions.