x A spinosaurus is bigger in size and its mouth is longer so that gives it a range advantage, but the T-rex is built for fighting other theropods. A trex is much more heavily built but spinosaurus has high size so it could use it to knock over the t rex and this isnt UFC so its not a brawl on the ground my overall answer is
Spino=56%
T-rex=44%
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t-rex because i has stronger bite fore and could just chomp down on the neck. It also had bacteria witch would be an instant kill. T-rex has a really strong skull. So T-rex would win oviously.
Trex would win because if you researched cardountasaurus you wuold realize it was a scavenger not a natural born hunter so its not a fighter
The elephant would win.
obviously army to army Persians would win by tactics but one to one a barbarian would win
raiden would win
Brock Leasnar would win
John cena would win in a fist fight an 50 cent would win in a in a gun fight