What-if battles

My vote is for Bigfoot. Since Bigfoot is a very elusive creature, we can assume that it is a master of it's environment. Bigfoot is a superior tactician. Bigfoot will probably have ambush attacks with stones and sharpened sticks. Now I am using all instances of Bigfoot to gauge Bigfoot's combat ability. Such as the "Rock Apes" of Vietnam and the Yeti of the Himalayan cultures. Bigfoot has been depicted using a stone axe in Native American cultures, spears in Himalayan cultures, and the Rock Apes of Vietnam throw large stones. So we can deduct that Bigfoot is highly intelligent, not quite up to humans, but more than capable. The T-Rex has brute force and large size, but it does have massive disadvantages from it's design. First is the position of they head and eyes. T-Rex can't see behind it without turning it's body, putting it off balance and making it unable to attack while turning or attack effectively. Another issue is that it will hunt via binocular vision and if you are in it's peripheral vision then if you do not move it will not turn it's attention to you. Same is with modern lizards. So given Bigfoot's intelligence, they will most likely use hunting techniques in order to kill the T-Rex. Hide in an ambush position and once they are out of the line of sight of the T-Rex, they will go in for the kill. Chances are that Bigfoot will know where the heart of a T-Rex, since the T-Rex's heart is in the same spot as the average deer. Even if the T-Rex spots Bigfoot in it's peripheral vision while Bigfoot advances, it will still have to turn in order to face the Bigfoot which still leaves it open to attack.

Bigfoot is a master ninja that cannot be seen unless he wants to. Therefore in this scenario, I think the Bigfoot would consider why he would want to battle the T-Rex. He has the skills, HAHA obviously. There is no currency or political game in this battle. I think Bigfoot would just avoid it.

you dont need to be smarter than an ape, apes are already smart enough to use basic tools and solve primitive puzzles and big foot is the missing link, hes smarter than them the t rex is a pussy ass bitch that scavenged the majority of his food, while bigfoot can take down a fucking deer with his bare fuckign hands the t rex has shit eyesight, hes gonna have to use his sniffer to find big foot and we all know big foot is the best fucking hider there is its gonna be an ambush from the trees, raining down sharply carved spears before the t rex even knows what the fuck was going on he would have a spear in his dam jugular, running and hiding as he flails about and bleeds out.