The lighting/shading mainly. The environments feels 'flat' in Horizon, while it has more 'volume' in DC. But I think it has to do with the engine than hardware. Anyway, I am watching England vs Italy (England play better at the moment...) which I assume some of you are watching also, so we just leave it as it is now.
Anyway, I rephrase myself, I did not meant DC looks substantially better than FH2, but the better lighting/shading(opinion) make it more next gen looking.
Anyway, like Menace said, no need to always compare. I will give the visual debate to rest. Both have their charm.