I,personally,disliked FF XII,and,since I haven't played any Deus Ex game,I can't form an educated opinion. So I'm going to say "Neither",and throw my own HD Re-release Dream into the ring. It's a tag-team.
-The Legend of Dragoon,with voiceovers for the plot mandated conversations. Amazing game,had (and still does,if remade) the potential to put RPG combat through a paradigm shift. Additions FTW! That,and the 32 item inventory forced you to be tactical about things.
-Final Fantasy VIII. Great gameplay,had a VERY fresh idea for magic usage,and a great story. Yeah,the romance between Squall and Rinoa got fumbled,HARD,and the plot seems nonsensical if you don't pay attention,but,overall,it's my favourite Final Fantasy installment. Maybe add some VA work for plot mandated conversations,too.