Best thing about GT was most of the character design, animation, and depiction of time; I liked how they aged some of the characters and seeing that character growth. I also loved SSJ4 and think it is the definitive final form. Not to simple, not too flashy, they go back to the black hair and the tail. That's the definition of coming full circle.
How people can stomach the skittle forms in super and still find them surprising is what baffles me.