Originally posted by h1a8
Colossus has always been bullet proof and cut proof (basically). Thor wasn't always bulletproof (later issues have him bulletproof on the lowest levels). So averaging things out Colossus is easily more durable to piercing attacks. Thor is more durable to blunt attacks though and has a much higher damage soak.
Thor's always been bulletproof.
Colossus has never been cutproof.
Riptide cut through him like a hot knife through butter.