The T-800 with no weapons will be chopped in half. He has a lot of intelligence and has a decent level of strenght but he will get bite sooner o later, the only way that he can win is if he can damage the T Rex´s legs and then attack the eyes, but if he get stomp he will be very damaged.
With a weapon, well depends. If he has a handgun he still loses but is he has a shotgun he will win.
I love the T-Rex too, but in fact the Spinosaurus would've won in real life too. He's larger has sharper and longer teeth, is more agile because he's a hunter and not a scavenger like the T-Rex. He has longer arms and claws with which he can grab and rip.
The JP3 Spino was falsely depicted, Spino is larger yes, but T-Rex were more physically built then Spino, and had a really strong bite force, Spino doesn't have the jaw strength or physical to do what he did in JP3 they're more slender. When the T-Rex got his jaws on Spino's neck that Spino should of been done for. Being Larger doesn't guarantee he'll win, Spino wasn't that much bigger, more length wise then actual mass, if you take away the sail Spino is not that much taller as well. Also if the Spino falls over on its sail it dies.
I saw a documentation 1 week ago based on the 2012 knowledge that proved that most of your points are wrong. In fact in was a direct comparison between T-Rex and Spinosaurus. Also, the Spino doesn't die when it falls on his sail but it will be slower after a while and his body will cool down, so it can't hunt his food. Maybe I can find a link for you but the documentation is in German and I'm not sure if you understand something.
Well the truth in my opinion is we'll never know who would win, most of the stuff I get I read up on certain sites or in books(not any of the wiki sites though I never go to them). They lived in separate times, and we don't know everything about them, most of what we know is more of a theory, both might of hunted and scavenged when they could, T-Rex was the only large carnivore in his area, so stealing another kill wasn't all that hard, the only threat was NanoTyrannos attacking their young. Spino might be stronger then what most think, and for all we know there might be a bigger predator then both of them still waiting to be discovered.
I think I might of read this before, about a year ago or more, during some debates on this rex vs spino on youtube I was about to jump in but then realized it's pointless, I really don't care who wins, though I still like T-Rex more.
Youtube debates are always pointless xD Had plenty of them myself. And you know, those articles are updated from time to time. But it's your decision. I like both T-Rex and Spinosaurus. I don't prefer one of them. There are other Dinosaurs, like the Ankylosaurus, who I like more.