I watched both series, I have comics that I bought here saved and I have already researched a lot about the lore of the story, but I must say that I love all the seasons of the legend of Aang, however the legend of Korra I only like book 3, the Red Lotus's plot is very good, it may be nostalgia on my part, but I think the other books are very weak.
For me, Korra doesn't have the same level of charisma that Aang had, there are several other characters that I like to see on screen more than her, Tenzin, Bolin, Jinora, Ikki, Asami, Varrick.