First of all, Dragon Ball Super is personally produced by the original author Toriyama Akira, and Dragon Ball GT is without Toriyama Akira. Therefore, Dragon Ball Super is more in line with the original style, while Dragon Ball GT is different from the original in style and story.
Secondly, the story of Dragon Ball Chao took place after the end of Dragon Ball Z, which mainly tells the story of Wukong and other characters fighting against various powerful enemies. Dragon Ball GT happened a few years after the ending of Dragon Ball Z, mainly telling the story of Wukong and Wutian looking for dragon balls in the universe. Therefore, the story of Dragon Ball Super is more coherent and close, while Dragon Ball GT is more like a series of independent stories.
In addition, the animation quality of Dragon Ball Super is higher and the picture is more delicate, while the production quality of Dragon Ball GT is lacking. In addition, the original cartoon of Dragon Ball Super was also well received in the process of serialization.
Generally speaking, Dragon Ball Super is more in line with the original spirit, with more coherent stories and higher picture quality, and has been widely welcomed and praised. Although the Dragon Ball GT has received some criticisms, it still has a certain fan base.