I don't think this is a good comparison, even though I get what you mean.
Tales of satisfies totally different audience. Bravely is more of a classic fantasy story, with princesses and castles and knights... etc. Tales is more of a battle shounen story.
I want to be honest and say that the story is not why you play a Bravely Default game. Gameplay mechanics (risk/reward system), job system, Revo music and a fine art-style are the highlights of this series.
Story/characters are not bad by any means, but don't expect too much.
I was going from the perspective of having an emphasis on the character's big (tropey) personalities rather than intricate plot.
Question for someone not super familiar with the series. I played the demo and liked it well enough, but don't Default and Brave mechanics basically encourage long drawn out battles? I didn't have much of a problem with it since I played the demo only up until that Bard boss but I could see that getting old. I also wouldn't be surprised if I was just playing the game wrong either.
It can be the exact opposite, especially for random encounters. If you can dish out the damage you can take out the enemies in a single round by going 4x Brave.