GT was much better written, it had actual characters and story, not a bunch of memes and one-liners that lack any emotion or coherence. Goku in Super is a retarded manchild "hero" that goes through an absurdly rapid transformation between the arcs. In GT, Goku still acts like an adult with years upon years of battle experience and his relationship with his relatives, especially Pan, is natural and touching. In Super Goku, Vegeta, Gohan and Freezer are complete meme characters, nothing about them is remotely believable or human. And why doesn't anyone care about deaths anymore? Suddenly gods, even more godlike than all gods before can handily rewind time and even return characters from the dead? How fucking convenient. What a way to kill tension even further. GT had the balls to add serious consequences to the overuse of the titular deus ex machina, and not add more badly explained asspulls.
As for direction, Super is utterly incoherent, badly edited and full of logical problems. GT is a work of a group of people who genuinely had a point to make.
I feel neutral about the series overall, and honestly don't care about trolling or contrarianism. Here is my sincere ranking:
1. "Dragon Ball GT"
2. "Dragon Ball"
3. "Dragon Ball Z"
Super isn't even a Dragon Ball series. It's a Marvel flick masquerading as one.