Personally I'd say FFXIII. Amazing gamplay, graphics and story.
I never much liked DA:O. Too much like Neverwinter Nights (yeah I know, same developer, but at least do some innovation!). That said, Neverwinter Nights was awesome, so Dragon Age isn't too bad if you're into it.
Of course, they are very different games, so comparing them is kinda futile. If you like the whole standard western RPG format and a bit more freedom, go for Dragon Age. If you like great storytelling and a whole new world, get FFXIII.
I never much liked DA:O. Too much like Neverwinter Nights (yeah I know, same developer, but at least do some innovation!). That said, Neverwinter Nights was awesome, so Dragon Age isn't too bad if you're into it.
Of course, they are very different games, so comparing them is kinda futile. If you like the whole standard western RPG format and a bit more freedom, go for Dragon Age. If you like great storytelling and a whole new world, get FFXIII.