Okay, no one's giving any info about Jin Kazama, so I'll do my own.
Scorpion has the advantage in mobility and versatility. He can instantly teleport with a thought to avoid his energy blasts and lasers. He is also very brutal in combat and can get past his regen which is Low-Mid. It says:
The ability to regenerate lost limbs, and even from severe organ damage or destruction, including traditionally fatal wounds and disembowelment or horizontal bisection. For machines and vehicles, this would be regenerating minor parts and more extensive internal damage.
This Regenerationn doesn't cover getting his face sliced off, having his head ripped off from an uppercut, getting his spine ripped out or splitting his head in half with his ninja swords because these are all forms of decapacitation and damage to the brain, which needs a higher form of regen (correct me if im wrong since I just came to this wiki). If that fails he can still melt the flesh off his body with a self destructing demon or just use his hellfire.
If all else fails, he can send him to the Netherrealm by raising his hands to teleport him there or by means of portals. Scorpion will become much stronger and his power will increase and surpass Jin's. This will prove useful against Jin's forcefields which protect him from attacks. It seems that he is able to activate them without even raising a finger, so I'd say it's thought based. It will protect him against projectiles, but he can still be harmed from the inside of his forcefield, which Scorpion can take advantage of with teleportation, his greatest asset.
Now, I wouldn't say that Jin will just stand there and let himself get hit, it's just that Scorpion is more mobile than him with instant teleportation which is why I didn't point out Jin's advantages. However, Jin Kazama has a chance at winning by knocking him out since Scorpion was tired out before.
In conclusion, I vote for Scorpion for being more mobile, having more options and being able to surpass his power in the Netherrealm.