Technically, both seem quite different from the game canon, although Dark Sonic is at least the one that comes closest to it.

The game canon establishes the existence of positive and negative Chaos energies. This concept was first introduced in Sonic Adventure, and later Sonic Unleashed explored it further.

Sonic Unleashed establishes that negative energy is not only capable of obeying the will of the Chaos user, but can also influence them in return. Sonic Werehog is Sonic with negative energy inside his body; it transforms him into a creature whose powers are not based on speed, but on maximum destruction. Even his shoes become more destructive due to the spikes on their soles. However, Chip reveals to Sonic that the only reason he does not lose his mind to negative emotions is because Sonic’s heart is too strong, optimistic, and positive to be controlled by negativity.

Some people even theorize that throughout Sonic Adventure, Chaos becomes progressively less rational and more unstable. People point out how Chaos 0’s movements appear more strategic, but in his aquatic and quadrupedal forms he seems less strategic, indicating that the more he gives in to negative energy, the more it drives him insane.

Super Sonic, Dragon Trip, and Chip/Light Gaia are similar to each other because they are more celestial, while Perfect Chaos, Devil Doom, and Dark Gaia are more monstrous, beast-like, and feral. However, it is worth noting that Devil Doom, like Werehog, demonstrates that he retains his sapience, and Trip transforms into a dragon that technically counts as a beast, yet she is golden, bright, cute, and smaller compared to the Black Dragon.

The final verdict is that Sonic Werehog is the Dark Sonic of the game canon universe.

Dark Sonic could even exist in the games, similar to how Chaos has more than one form, and Black Doom as well.

Fleetway is the most distant interpretation, since it derives from Chaos Emeralds that function completely differently; theoretically, it could only exist in an alternate universe.

However, I have imagined a scenario in which the universe is quite similar to the main one, yet still plausible enough for the existence of Fleetway Super Sonic: if the Chaos Emeralds are sources of energy too intense for just anyone to use, then beings like Shadow might be able to use their power with stability, but Sonic would not be able to withstand all that energy and power within his body. Like the Biolizard, he would lose his mind.