DC is doing alot more graphics wise than Horizon 2. I may be wrong but isn't DC also doing dynamic lights all over from headlights, to the sky and everything else in between.
Someone can correct me if i am wrong or better explain.
That said both look awesome and i wouldn't mind having both, but i can't afford both so i stick to my PC.
Too early to say but everything you just mentioned is in horizon 2 as well from the preview yesterday.