I only started watching Prime recently, because the animation seemed very "kiddy" to me. (Plus for some reason I found the lack of noses really really off putting o_o). BUT I have to say I was pleasantly surprised. While maybe appearing "kiddy" at first, I was impressed with how mature they handled certain things like death and loyalty. As a 40+ adult there are things I would have liked to see changed, but all in all I was happy with Prime. RiD not so much. Never saw Armada or Energon but heard bad things about them.