Biorr obviously wins. Not only can he solo a late game boss, he can take on a dragon for ten minutes straight. --- Silvy owns my pants...and my soul. Please sign this petition if you want the bbox glitch in Dark Souls: http://tinyurl.com/9f9gv8y you are our only hope.
Tarkus died in Anor Londo (confirmed by the crestfallen guy), which means he couldn't even make it halfway through the game. That's a poor showing honestly, even if he was leveled enough to tank the iron golem.
Biorr more or less slept his time away like the lazy old man he is, but when he finally got up he was able to tank both a high-damage boss and a bridge-slaughtering dragon for extensive amounts of time.
Additionally while you can't ever actually challenge Tarkus to a fight, fighting Biorr in the Nexus (in case you're doing Mephistopheles's quest or something) is a challenging affair with his high health and damage. Fighting Biorr is rough and takes forever, assuming you don't kill him with the glitchy poison cloud reactions.
I've a feeling that Biorr would kick Tarkus off a ledge and then take a nap. --- Bane even prayed for Dick when he became Batman. -- Frostbite_Zero
I'm pretty sure the Great Sword from Demon's would easily crush Tarkus' poise. ELSS sent people ragdolling across the field in Demon's now they're toothpicks. --- Darkwraith Ranking Officer. Spirit in Black Until The Journey's End.