There's a reason that when somebody says they like Avatar, you know what they are talking about. They're talking about Avatar: The Last Airbender. Even if you ask to clarify "which Avatar," it's just a formality. The ratio of fans of James Cameron's Avatar to Avatar: The Last Airbender is embarrassing to the former. In terms of cultural impact in general, there is only one true Avatar.
One of the best things about Avatar: The Last Airbender is its rewatchablilty. There's something about the show that's much easier to revisit than many other children's animated shows. While they were airing, Nickelodeon might have prioritized shows like Spongebob Squarepants or The Fairly Odd Parents more than they did Avatar, but Avatar's the show that has had longevity and an unprecedented cultural impact. No matter which kind of elemental bender you see yourself as you'll love the following Avatar: The Last Airbender memes.