Let me lay out my reasoning and if you still disagree, then we'll call it 5-5.
To me Spear is a riskier version of shoulder but warrants much more damage, So I'll call it even there. Hellfire is a less riskier version of Lightning that warrants the same damage but lightning knocks down so I'll call it even there too. Hatchet and arrow are good moves but nothing crazy. Takedown and TP are good too but again nothing to tip the scales.
EX shoulder vs. EX spear serve the same purpose, but again EX Spear warrants a lot of damage whreas NW is safer on whiff, so I still say even.
EX Lightning > EX Hellfire, can't argue with that. (+1 to NW)
EX Takedown & TP > EX Hatchet and arrow. EX Hatchet is good for extending combos and pressure and ex arrows are just whatever, but these are not near the impact Scorp has with his takedown and TP. EX Takedown is a safer version of Sub Zero's slide but not quite the reach. EX TP is practically a get in for free card if people aren't paying attention and blows up instant air fireball characters for half life. (+1 to Scorp)
So far its even and we are left with normals and the in close game and punishment.
NW doesn't have a mid/low mix up with his normals or special moves. Scorp has a safe overhead, and a safe low string that does 14%. He has a jab string that has an in-built overhead launch that can be mixed up with safe takedown. And finally if he needs to make a comeback he has high risk 50/50 that everyone already knows about. NW has nothing like this at all. NW only has pressure/throw mix-up...which Scorp can do almost as equally with his 111 string. (+1 Scorp)
Finally, Scorpion punishes harder than NW I think too. Spots where NW has to settle for a shoulder Scorp gets a spear. Punishments where the character is left flipping in your face (like blocking a Kano ball) both get about 40%, but Scorp gets a vortex which is huge. And finally some obscure punishments like Mileena EX TP, JC flip kick ect. Scorp gets 30% plus vortex. I don't think NW has anything close to that to my knowledge. That, and Scorp has one of the best anti-airs in the game as well with d1 which I don't think NW has to compare much with either. (+1 Scorp)
So there's my reasoning. Scorp wins by 2 points in my book. Zoning-wise I think they even out pretty well, I just think Scorp wins with his mix-ups and his ability to punish better. If you still think its 5-5 then I don't mind, it'll make me feel better if you beat me in the future.