These two aren't parallels though. King of Sorrow is parallel to Nahatomb, Ghadius is parallel to Leorina, and Joka is parallel to Tat.
I agree with this, but also I think Ghadius is a more representative villain of DtP, so it works fine for this.
As for who would win, uh..I don't know? On one hand Ghadius could trap Sorrow in his worst nightmares, which I'm sure as a perpetually depressed being he has a lot of. On the other hand, Sorrow seems to get stronger the further into despair he sinks, so that might backfire on Ghadius, and he could cripple him with depression in return.
I'll be honest, despite my team, I'm leaning towards Ghadius winning this one. But it's a toss-up.
Also, source on the pic, please? It looks really interesting.