Played Dragon Age. It's a brilliant game. I won't say one game is better than the other because though both are RPGs, both are structurally very different.
Dragon Age's world is not as open as Divinity 2, but it has a level like system. Character classes are specified- Warrior, Rogue and Mage. They're not as flexible as Divinity 2.
Dragon Age: Origin's story is just as complex as Divinity 2. May be even more. There are numerous choices, and their outcome matters greatly. The game has lots of dialog, which would feel like cinematics.
One last thing, as SheaOhmsford mentioned, combat does not vary with your personal skill, but with how you level your character and your party members. That way, Dragon Age goes closer to pure pen and paper RPGs, like D&D, where as Divinity 2 is an action RPG at core.
