I definitely have to go with DBZ. I started watching it when I was 6, so it has definitely had the single largest influence on me by any anime. Never was a fan of GT, knowing it wasnt Toriyamas work ruined it for me. Never could really get into Dragonball either because my views were already shaped by DBZ, and it was difficult watching 12 year old ssj2 gohan destroy people, then trying to go back to tournaments with power levels in the 100s lol. I got used to the big fights and planet level destruction