Quote Originally Posted by Aesop View Post
really where twf is beaten on by thf is in cases with non bypassed DR... then thf gets the biggest bang for the buck straight out.

Aesop
Well, it's also beaten out by the whole Strength x 1.5 rule and the x2 rule for Power Attack too. When a THF hits with his main swing, he's going to get his full Strength bonus and Power Attack bonus. The TWF is goign to have to hit with his off hand just to get that 0.5 that he "should have gotten" when his primary hit. And then, of course, TWF's get boned by the Power Attack rules.

And of course you have to keep taking feats just for TWF to "keep up."