If I just looked that the two highlight videos I would think that Jourdan is the better CB. Thoughts?
In all honesty, it's not a fair comparison. Both represent opposite sides of the corner back spectrum. From that perspective, they are pretty close to equal, though, they excel at different things.
Jourdan is a better press corner; he excels at staying in a receivers hip pocket. To be honest, he was one of the better shadowing corners available in this draft. His legal issues combined with his diminutive size, dropped his value tremendously. A few inches taller, a few pounds heavier, and no legal issues, he likely goes at or around the top of the 2nd round, if not late in the first.
Chidobe is a borderline Safety, who was one of the better read/react db's in this draft class, which makes him an excellent fit for a zone defense. He will definitely play outside corner, but you can put him anywhere, whereas Jourdan will likely see no spots beyond the Nickel.
So like I said, it's really not fair to compare them.