OG Dragon Ball is a comedy at first and a shonen second, so it will be centered on adventure, jokes and fights. There is always a reason about everything, it's not just "I want to be the stronger and just want to fight stronger people", the characters have backstory and the troubles are really interesting to watch.
Dragon Ball GT actually is a direct sequel to Dragon Ball Z; it takes place several years after Dragon Ball Z ends. It was not based on a manga by Akira Toriyama. It was an original story created by the anime studio. As far as I know (I never finished watching it), it was completely compatible with the story of Dragon Ball Z.
Out of curiosity, I looked up the two titles this morning in Jason Thompson’s Manga: The Complete Guide. His reviews list the age rating from Viz – 13+ for Dragon Ball and All ages for Dragon Ball Z. But he also writes in his review that Dragon Ball contains violence, nudity, sexual humor while he only writes that Dragon Ball Z contains
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does dragon ball have a manga