From owning aggressive, predatory fish, cats and dogs my two cents are:
The relative bite force, sails, arms and size differences will play secondary role to attitude and reactions of each dinosaur.
Fish with smaller teeth and smaller size often kill larger fish because of differences in aggression and combat behaviour. Similarly with cats fighting over cat chow and dogs over dog chow.
My guess is if the dinos are trapped and must fight, TRex would win the most as it was known to hunt in packs (suggesting that it was intelligent and a more precise killer than the more likely solitary hunters the others were- as a lion is over a Crocodile)
TRex also had that incredible bite force as an evolutionary adaptation when there others didn't. This suggests it adapted to using its bite to kill larger prey (by maiming and waiting for the prey to harmlessly bleed out) while the others were scavengers often, and the spino was a fish eater mostly.
The T-Rex would in this case have major advantages in fighting behaviour.
If the dinos are allowed to flee, the Spino would win more often against all but the T-Rex, as these scavengers would avoid a fight with a larger carnivore- even if said carnivore would likely loose the fight due to never really facing such large, dangerous prey.
T-Rex might also flee, or might fight out of instinct. Tough to say.
Just my thoughts.
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