Because the Gaang is composed of legitimate prodigies and Korra's team is run by Korra. It's like the 5 smartest kids in your school getting together versus the over-confident class retard leading a bunch of C-students.

>>153231907
Because their all just shitty versions of the original
>Korra is a trash Avatar despite starting out with 3/4 elements learned
>Mako is a literal poor mans version of Zuko with not a single impressive feat to his name in 4 seasons
>Bolin while obviously not holding a candle to Toph does at least improve and learns multiple forms of bending
>I dont even remember Korra's gf's name because shes such a non-character who does nothing, compared to Sokka who while having no powers is the teams best warrior and strategic genius

>>153231907
Bolin was a store brand Sokka except not funny in the slightest
Asami had no character at all, barely salvaged by a design that appeals to coomers
Mako just sucked
Korra's dog could never compete with Appa or Momo and so they dropped it as the series progressed just to bring back more sky bisons

>>153231907
They also broke that eons age tradition of traveling around the world to learn the elements. So get a sheltered Avatar that

Aang mastered all the elements at 12. This is like becoming Hokage at 12.

>>153231907
>compete
In what way? Because honestly, Zuko aside, the orginal gang were all sort of fucking terrible and annoying, where Korra's team's biggest offense is being bland and uninteresting.