Android saga/cell saga were the best in my opinion.I loved Android 17's sense of humor, and android 18's nonchalant attitude towards everything.Piccolo vs android 17 is probably one of my favorite fights out of the entire series, It's nice to see a non-saiyan kick some ass once in a while. Android 16 vs cell was extremely epic as well, it was such a surprise to see the two of them go at it, Dr.gero's creations trying to kill each other. Buu saga was meh, the fusions made the saga, if it wasn't for gotenks and vegito the saga would have fallen flat on it's face. GT was also pretty bad. But all in all DBZ is my favorite anime, it really entertained me during my childhood.