Interesting matchup! Now, to determine who truly is superior! Let's start with the stats. Since speed is equalized, I'm gonna ignore that and move on to the next two stats, strength and durability. Both characters' profiles explain that they are at Wall level Attack Potency, but unlike Bendy, the Demogorgon likely has higher Striking Strength, which means that it will deal more damage in a fist fight overall than Bendy. However, due to his excellent Regenerationn due to his ink, Bendy could take it, and then some. And as for intelligence, ehh, I'll give a slight edge to Bendy since he actually employs tactics when he hunts his human prey, unlike the Demogorgon who relies on pure instinct.
The real debate, however, lies in their powers and abilities. And frankly, not a lot of what the Demogorgon can do will be very helpful here. Its Enhanced Senses allow it to detect the faintest amounts of blood, even from a parallel universe. But Bendy doesn't have blood. He's made out of ink, which literally is everywhere in Joey Drew Studios, so this will not help the Demogorgon at all. Its Electricity Manipulation doesn't really affect Bendy that much, and its Portal Creation can be somewhat countered with Bendy's Psuedo-Teleportation. And even its own Regenerationn is inferior to Bendy's, seeing as the Demogorgon has a Mid-Low Regenerationn, whereas Bendy has a Mid-High Regenerationn. In fact, the only power that will likely help the Demogorgon here is its Telekinesis, which should be comparable to Eleven's, who flipped a car over with her Telekinesis.
However, unlike the Demogorgon, Bendy has a good variety of ways to deal with his foe. For starters, he isn't alone here, since he can create ink monsters to help him fight and overwhelm the Demogorgon, and if he manages to grab the Demogorgon, he can corrupt the Demogorgon with his ink, practically turning it into another ink monster. And, due to his ink-like properties, it will be very hard for the Demogorgon to deal any lasting damage to Bendy, due to his Psuedo-Teleportation and his Regenerationn. And because of the location, the Upside Down version of Joey Drew Studios, this means that Bendy has more than enough ink to deal with the Demogorgon, thanks to his Ink Machine, and he knows this location like the back of his hand. So in the end, it seems as if the being from a parallel universe will soon be drowning in Bendy's ink sooner or later.
Winner: Bendy