I like the setting a lot more. It creates a cooler atmosphere. Also, the writing and story seems to be a bit more mature than The Last Airbender in my opinion. The characters are just as lovable, and the animation is top-notch.
1. Mirrai Niki (future diary)? I've personally never seen this. So I have no opinion on it. I'll add this to my queue.
2. Naruto Shippuden? I used to watch Naruto religiously. Then for some odd reason I just stopped. There have been so many episodes since I last watched it that I've lost the...