User blog comment:Jet Set Ronnoc/the real ultimate lifeform/@comment-101.160.155.231-20120610100928

I'd say neither because "if" Sonic ever turned dark (Dark Sonic) then got all the Chaos Emeralds, and then tranformed into Super Dark Sonic the Hedgehog (longest name in sonic univeres) which means Sonic is the ultimant lifeform because it's possible he can do that, while chesse and shadow have had countless defeats at the hands of Sonic, Tails, Knuckles, Espio, Vector and Charming.