I think that if you did a Naruto RP, it would be pretty much just with people who have watched and enjoyed the show, or read the manga. As someone who has never cared for Naruto, I wouldn't really care for it. The amount of lore you would have to include to make someone like me understand the world would probably be pretty significant.
Dragon Age would probably be more accessible to more people. Sure, there is still the lore problem, but at the same time, its a universe that can make more sense to the average person who never played it. "Its kind of high fantasy, and its got some dragons, and wizards and crap."
In the end, its up to you. There seem to be plenty of people here who wouldn't mind a Naruto roleplay, and a good Dragon Age roleplay would probably catch my eye.