Actually Im not someone who just gives no-brainer answers without knowledge...
I own all three Fatal Fury Movies on dvd.
But going through Scorpions history of movies, games, shows, and comics... Scorpion would come up on top.
Terry fights god like beings all the time. If you remeber in the anime Terry was taking blows from a being made out of energy (god of war). Geese Raising Storm technique was powerful enough to level a forest. Terry is fighting people like Orochi (a god), Rugal (Omega Rugal with Orochi power), Igniz who is very powerful, Mukai (a god like being that haves the power of stone), Kyo, Iori, and countless others. Scorpion is just out of his league.
By reminding him that he is kof 2k3 Terry and not anime Terry.
Scorpion stomps. He is a bloodthirsty revenge fueled ninja specter from the depths of hell for crying out loud. Besides his killing techniques and weapons, he can also use teleportation and illusions, but more importantly, he is a flame user who actually HAS proved he can quickly incinerate people with his flames like he did with the original Sub Zero. In his MK4 ending, he actually lifted Quan Chi with telekinesis and made him explode with a single energy ball.
Also, the MK universe is filled with mutants, half man half dragon monsters, killing machines, reptilian abominations, sorcerers, gods, demos, zombies, etc. Terry would get his ass kicked on a daily basis there.
That's all? Terry Bogard can easily overturn cars and trucks, defeated a group of NESTS soldiers, and defeated opponents way over Liu Kang's league. His Power Geyser KO'd Wolfgang Krauser (a fighter that even Geese Howard fears) in one shot.
All Scorpion has done was kill the original Sub-zero and send Quan Chi to Hell. He got his ass handed to two Oni.
I don't know what game you were playing but the Scorpion's MK4 ending shows Scorpion sending Quan Chi to the Netherrealm.
Yet some Bruce Lee wannabe can survive through that? You might want to check out the SNK universe because much of the fighters would completely waste all of MK. Just look at the bosses of Fatal Fury and King of Fighters. Mukai alone makes most of MK look absolutely pathetic.
Only Shao Kahn is stronger than them but he's still below Orochi and "Those from the Past". Geese Howard's Rising Storm is of greater power than anything Goro can throw out and he's not even on Krauser's level.
Too bad it's non-canon and the only way Scorpion is beating Quan Chi if he's in the Netherrealm with him.
All three are waste Lui Lame and Kung Lao alone.
K' fought armed soldiers and survived and fought opponents and defeated Krizalid (who makes razor whirlwinds by kicking, can punch real fast, and has pyrokinesis at a much greater level).
Iori, as a kid, crushed rocks in his hands. As an adult he can slice people up with his hands, defeated Goenitz (who's control over wind is so powerful that he easily destroyed a coliseum with a hurricane and gouged Rugal's eye with a gesture), and has has pyrokinesis on a great level where he easily makes explosions and create flaming geysers. He once punched Kyo so hard that he flew 30ft and crashed into a cliff.