Turtle has highest defence, for tanking really. Dragon is for dealing huge amounts of DPS.
LuckyGuys amazing news they fixed the bugs (Ios only though) And they fixed mobs not spawning (im guessing floaty gross, corruptors, and paladins) And most importantly SOULS OF NIGHTS! I cant wait until this applies to android! The hype is too much! X3 (Hope it works for the ios users )