User blog comment:GaoMikadoFan 4/DDW vs DW/@comment-5480547-20141005113843

In my opinion, Dragon World and Darkness Dragon World are completely different except for the fact that both of them are related to dragons.

Darkness Dragon World is more of a pure offense, shown by the majority of 1000 defenses. As I (in my opinion) see it now, Darkness Dragon World is a "kill your opponent before they kill you" kind of deck. Though, Spectral Strike is technically defensive because it benefits you when you destroy your opponent's left/right monster. Eh, I don't even know.

Dragon World, on the other hand, is more of a wildcard. Being the most supported world in the game, you have many options from Jackknifes and Armordragons, to things that have 'Knight' at the end. You could have a defensive deck relying on high defense monsters or soulguards, or an offensive deck with all of the three crit size ones, including the penetrate, or some sort of balanced deck.

In the end, I'd recommend trying them both and using which suits you. Well, that's my opinion, so... Yeah.