Are you asking what do I enjoy from GT? Several things.
The plot, the fact that Goku was turned into a kid again (And by the Pilaf gang, no less! Loved how the very first main antagonist of the original series was the one that set the events of the final series in motion. Also kid Goku >>>>> Adult Goku), the shorter fights (DBZ's fights were just too damn long), the characters and their personalities (Inherited from the end of DBZ). I especially LOVED Goten and Trunks.
The music (BEAUTIFUL in the original version, I haven't heard the US versions). The SSJ4 transformation and how it was achieved (By Goku, at least). I loved Pan and her closure. I loved the shorter story arcs (Currently I have no time to watch long animes). The exploration, sense of adventure and goofiness of the first arc (Which was pretty much a tribute to the original DB). Loved the new character designs (Vegeta is BOSS). Loved Piccolo's fate and his ultimate decision. LOVED how the Dragon Ball themselves, and the protagonists' dependance on them, was the final issue that had to be solved.
And of course, it has the best ending of any Dragon Ball-related material, and gave me a true sense of closure to the story of Dragon Ball.