Dragon Ball >= Dragon Ball Z > GT > Chou
The original Dragon Ball series was a nostalgic series to me, it was all about adventuring out with everyone, Goku learning more of the world, training, meeting new people and collection the Dragon Balls and at the end entirely saving the world from Piccolo's rein which put the icing on the cake.
Dragon Ball Z itself was enjoyable with all of it's character development, Goku entirely learning more about himself and raising a family, and not to mention all the cool fights which sadly went repeating for the next few Sagas till the end.
Dragon Ball GT itself was also good, it tried to bring back the old vibes from dragon ball by having the same animation style as it did, making Goku a kid again and also taking from Z, the battles. Some people may not like it for a few mere reasons like Pan, Kid Goku and the old art style but it was still good.
Dragon Ball Super, on the other hand, is not done so well, it's just a mere repeat of everything and taking things from the old series into a random collage like new transformations and the martial arts tournament. It made Goku's character more like an villain that just enjoys fights and not the old fun Goku that will do anything to save the world and do nothing to cause the end of the world himself, which he did in Super.